Nocturnal bright halos & spherical aberration

Halos: definition

The occurrence of halos light night is a side effect reported by corneal refractive surgery LASIK or PKR. They match the perception of halos more or less extended around light sources, and are generally seen in the following circumstances: fall of day, night, dimly lit room, subway platform, night road... In these circumstances, the IRIS pupil dilates to collect more light: the light rays that pass through the pupil on the outskirts are less well refracted and contribute to the increase in the rate of optical aberrations, and the degradation of the quality of the retinal image.

halos at night headlights

Example of nocturnal halos around the car headlights and signal lights.

In addition to the dilation of the pupil, the high dynamics of the Visual scenes contributes to the increase in the perception of halos: bright light standing well out a darker environment. headlights of vehicles, street lights, neon lights, etc.

Review by OPD allows to confirm the optical source of halos, and point the cause, which is often linked to a rise in the optical aberrations of high degree (ex: spherical aberration). The spherical aberration of positive sign is particularly involved in the genesis of halos felt after surgery for nearsightedness.

Currently, most of the halos felt after surgery dissipate in a few days or weeks: their incidence is low because treatment issued by the current platforms are optimized so as to preserve the aspheric profile of the cornea (prolate), and issued on more wide optical areas than a decade ago.

Causes of halos

Halos can be caused by two types of optical anomalies:

(1) the reduction of the transparency of the eye circles: corneal edema is a classic source of halos (halos are typically colored or iridescent in this context). The occurrence of a cataract can be accompanied by halos.

(2) the increase in the rate of optical aberrations of high degree, on the first plan of which the spherical aberration.

These causes can be associated: nuclear cataracts typically causes an elevation of the spherical aberrations of negative sign, and is accompanied by definition of reduction of transparency of the lens.

Elevation of the eye spherical aberration

The increase of the spherical aberration causes are either corneal (refractive surgery, corneal Pathology), or cristalliniennes (nuclear cataract).

Corneal surgery (LASIK, PKR) myopia may increase the rate of spherical aberrations positive: even when the asphericity of the corneal profile is controlled by aspheric treatment, the peripheral camber induced by the area of fitting with the raw edge (geometry oblate) systematically causes an increase in the vergence to the edges of the optical zone.

Schematic representation of the spherical aberration is positive;

Spherical aberration of a spherical diopter for a light source located on the optical axis 'at infinity'. The spherical aberration is the fact that the incident rays away from the optical axis are refracted in front of the fireplace main paraxial. The envelope of the refracted rays is called caustic. Spherical aberration causes an enlargement of the focal spot (PSF). A perfectly spherical curvature lens produces positive spherical aberration.

Conversely, corneal surgery to the hyperopia (this surgery is performed through the LASIK technique essentially) can increase the rate of negative spherical aberrations for opposite reasons: flattening marked toward the periphery of the optical zone (prolate geometry) is a reduction of the vergence to the periphery of the optical zone. The rays refracted by the edges of the cornea are focused beyond the rays focused by the centre. This modulation may be used to compensate for presbyopia: in this case, to be the Central rays 'short-sighted' (near vision), the reduction of the vergence to the periphery so ensuring an emmetropisation (for distance vision).  The photoablations laser to induce a cornea hyperprolate are based on a "Customizing the Asphericity factor (Q-factor)..

The appearance of a nuclear cataract is a classic case of elevation of the negative spherical aberrations. In case of nuclear cataracts, there is an increase in the refractive index of the core of the lens, causing a "index myopia": the center of the lens has optical power (vergence) more than the peripheral cortex. This difference induces a negative spherical aberration.

 Halos after corneal surgery risk factors

The risk factors of halos of myopia (LASIK or PKR) excimer laser corneal surgery are:

-The degree of correction issued: halos are rare below 5 diopters of correction, because the connection between the central area (Flattening) and the peripheral zone induces no major increase in corneal curvature.

-The type of correction issued: the aspherical, optimized or guided by the Wavefront treatments are designed to reduce the risk of nocturnal light halos

-Pupillary diameter: halos are nocturnal because pupillary dilation increases the proportion of light rays refracted by the outskirts of the optical zone, or the area of transition where the corneal curvature is undergoing a rapid increase (connection between the 'decambree' central and peripheral area untreated).

 Clinical example: halos after surgery for myopia

The following clinical example is particularly illustrative: a patient was operated of myopia (-5 diopters) in the early 2000s, by a laser treatment of surface (PKR) issued on a small (5 mm) optical area. Since the intervention, the patient reported disturbing nocturnal light halos, that disrupt it for driving at night.

In these circumstances, the halos are related to excessive refraction of light devices:

comparison natural emmetropia and post surgery refractive spherical aberration

Both eyes are normalsighted, but the operated eye of refractive surgery has a higher positive spherical aberration.

Topo aberrometrique (OPD SCAN III, Nidek, Japan) examination to measure:

-a profile corneal oblate (positive Q factor), generator of positive spherical aberration of corneal origin.

-a marked elevation of optical aberrations of high degree of type positive spherical aberration.

review topo aberrometrique done by the scan with positive spherical aberrations. opd

Reading topo aberrometrique done by the topographer, aberrometer OPD SCAN (Nidek). On the left, the map of local ocular vergence reveals a 'Emmetropic' central area (in green) and a Crown of residual myopic refraction (in yellow/orange). At the Center, the map of corneal topography specular shows a profile of oblate type: the center of the cornea is less camber than the periphery.
The red boxes highlight: the elevation of corneal optical aberrations - for a pupil diameter 6.44 mm in conditions mesopiques, Asphericity oblate (Q = 0.89), the spherical aberration corneal (Cornea SA) of type positive and high (0.807 microns for a box of 6 mm). Corneal spherical aberrations positive rise is related to the change of the corneal profile: oblate character induces an increase in the peripheral rays vergence.

The map of vergence in the pupillary area reflects the importance of changes in vergence between the Center and the edges of the pupillary area: greater anterior corneal camber induced peripheral excessive refraction of rays, is a peripheral "annular myopia".

map OPD aberrations spherical post refractive surgery

Variations of the refraction within the pupil in a surgery patient of myopia: there was a marked increase in the peripheral vergence, while the centre of the pupillary area is "Emmetropic. When the pupil has a small diameter, light rays converge in the fovea, and the image is sharp. When the pupil dilates, are in addition to these central rays a contingent of peripheral rays that converge in front of the retina, and then deviating, and thus reduce the contrast of the image formed on the retina.

The maps of ocular wave-front full, corneal and internal to quantify the elevation of spherical aberrations for the various contingents of the eye:

maps of Wavefront, positive spherical aberration after surgery for myopia

Maps of the eye, corneal, and internal wave front (subtraction between total and corneal eye aberrations earlier). Aberrations of spherical type predominate (box): they are mainly of anterior corneal origin. Note the appearance of the Wavefront in "roundel", and that some of the "Point Spread Function" (PSF) - arrows, that remind of the geometry of the perceived halos (light Crown around a central point). Internal aberrations in part offset the corneal aberrations (phenomenon that we have described and published: Gatinel D et al. Comparison of corneal and ocular aberrations before and after myopic LASIK total.) J Refract Surg. 2010; 26 (5): 333-40.

The origin of spherical aberrations rise is to seat the geometry of the anterior corneal dome that can be view in Cup:

profile corneal oblate (Cup pentacam)

Viewed corneal profile into cut camera Scheimpflug (topographer Pentacamn, Oculus). Has the naked eye, it is difficult to judge the asphericity of the corneal profile, which is estimated at Q = + 0.89 about (oblate profile). The Summit of an oblate ellipse profile similarly Asphericity positive (0.89) is represented below. Oblate profile is generator of spherical aberrations of positive type.

The decomposition of the anterior corneal profile in Zernike polynomials found unsurprisingly increased with symmetrical terms related to the "spherical aberration":

terms of zernike decomposition pentacam

Decomposition of the anterior corneal surface in terms of Zernike (topographer Pentacam): these terms do not correspond directly to optical aberrations, but the corneal profile: they reflect the deviation of the corneal surface to a surface reference ellipsoidale. The highest terms correspond to those who are used to "model" the oblate of anterior corneal profile: spherical aberration of 4th order (n = 4), and 8th order (n = 8).

To remedy these halos, it is possible to advocate for lighting the Interior of the vehicle when driving at night (by turning on the Interior lights as a ceiling light). Some eye drops such as brimonidine (Alphagan) can also reduce the increase in pupillary diameter in terms mesopiques. In some case, surgery may be suggested (extension of the optical zone).

Halos after correction of myopia in Orthokeratology

The Orthokeratology can temporarily correct low myopia and average: this technique is based on the port during the night of rigid contact lenses, which cause a reshaping of the epithelium of the cornea in his serving central and paracentrale. The epithelium of the cornea regenerates quickly, and induction of prolonged Central compression out of the night cause a thinning of central and peripheral hyperplasia. The Central curvature decreases (Flattening) and allows to correct nearsightedness (reduction of the corneal vergence) during the 24 to 36 h after removal of lenses in the morning.

Horizontal section of the cornea in OCT high-resolution (Zeiss Cirrus) after Menicon Z Night lenses for the correction of low myopia. Night support with the lens causes a redistribution of the epithelial layer, which thins at the Center. This flattening causes a reduction of the Central curvature of the cornea (relative flattening, and reduction of the optical power of the corneal diopter).

Horizontal section of the cornea in OCT high-resolution (Zeiss Cirrus) after Menicon Z Night lenses for the correction of low myopia. Night support with the lens causes a redistribution of the epithelial layer, which thins at the Center. This flattening causes a reduction of the Central curvature of the cornea (relative flattening, and reduction of the optical power of the corneal diopter).

The Orthokeratology does not directly control the asphericity of the corneal profile, and it always takes a geometry oblate, causing a rise in positive spherical aberration. Flattening the night port-induced is maximum at the center of the cornea but decreases rapidly (it causes a reversal of the corneal Asphericity which becomes oblate).

The example following matches that of a thirty-something, initially nearsighted of-2.50 patient D, corrected for several months by the port orthokeratologique (night) of rigid lenses (Menicon Z-night) and who couldn't drive because of the induction of important nocturnal halos. In the 24 hours following the withdrawal of the lenses, her visual acuity was 12/10th without correction. The comparative review topo-aberrometrique (OPDscan III) to illustrate the consequences of a rise in positive spherical aberration related to a profile corneal excessively oblate. Functional optical area (allowing from light rays from distant sources to be focused on the retina) is too narrow, the rays refracted by the corneal periphery to mesopic condition (and who are not stopped by the iris because they go through a dilated pupil) are focused in front of the retina. This explains the occurrence of halos in conditions mesopiques.

before Orthokeratology

Card OPDscan before adaptation in Orthokeratology. The corneal profile is very slightly prolate, and weakly positive spherical aberration.

After Orthokeratology

Map topoaberrometrique performed after Orthokeratology. Induced flattening is very central is sufficient to correct nearsightedness, but it is not enough to provide a correction for the most peripheral rays. The corneal profile is very oblate, and the elevation of the positive spherical aberration is major.

halos size apparent

When the examination room is darkened, the observation of a white disk on a black background to objectify the presence of a halo, the apparent size for the patient is determined by "framing" virtually one between the thumb and forefinger of an examiner. This halo is related to defocusing of light refracted by the periphery of the pupil (note the rapid increase of the vergence to the edges of the pupil).

 

29 responses to "night light halos & spherical aberration"

  1. LOHMANN Serge says:

    The surgery 4 months ago of a cataract in both eyes, I suffer d' a phenomenon of halo around bright points. The implanted lenses are multifocal type. Find it me difficult to drive at night, the halos being very wide.
    Your document is extraordinarily complete and deals closely with the phenomenon that concerns me. I will go back to the surgeon ophthalmologist if it does not improve in a few months.
    Thanks for the explanations.

  2. Dr. Damien Gatinel says:

    Halos caused by multifocal implants are generally very geometric (circulars) and reflect the existence of a percentage of defocalisee light (light that is focused toward the fireplace, for reading, is seen as one or more small rings or shiny discs around bright lights observed by far). They are however that rarely a source bothers major for driving or other activities.

  3. Benoit says:

    Hello doctor, I am 53 years old and for about 3 years I see halos with my eye left exactly as described on the photo, and the objects seen backlit by luminous time take on their contours a transparent border. I consulted 3 ophthalmologists whose two found nothing abnormal in the tests, it was finally the last who noticed the beginning of cataracts (according to him) but he refuses to operate on me saying that my view is still too good. It is done after three ophthalmologists which saw two unrelated abnormal I doubt the diagnosis.

    The symptom appeared suddenly, I would almost say from one day to the next day, I returned the question in every sense also next to an accident that I had left eye 25 years ago, indeed, I got hit by a piece of wood in the eye, it was very painful, the hospital they put me drops that asleep my eye then 15 days after it was restored without Visual except a very slight consequences split and colors a nothing more dull without being able to say if it was already before the accident or not. Also ten years ago in the same eye he was back a feeling of stone in the eye, like a wound that would be open, it lasted a few months, then I decided me to put drops healing properties and the feeling disappeared, the no problem view ensued. I obviously reported these facts to ophthalmologists that I saw but this level also have nothing seen abnormal.

    I remain very skeptical about the causes of the occurrence of the symptom of halos, cataract? Damaged cornea? Or other? I have a feeling that the diagnoses were not enough in-depth.

    Thank you to give me your opinion. Kind regards

  4. Dr. Damien Gatinel says:

    In the from your eye history, the presence of opacities (cataracts) crystalline seems the most likely cause the perception of luminous halos. A review of measurement of intraocular broadcasting (scatter index) by the OQAS (or HD Analyzer) instrument and an analysis of ocular wave-front (OPD) might support the presence of intra ocular opacity.

  5. Benoit says:

    Dr. Damien Gatinel says:
    12 September 2015 at 0 H 43 MIN

    Thank you, I feel plenty, but then what's weird thats why the option of laying of an artificial lens is pushed back believing that my view is still 'too good '? It seems to me that the cataract surgery is encouraged of the first symptoms?

  6. Yannick says:

    Hello doctor,

    If you are the doctor Gatinel who officiated there are a dozen years on hospital Rothschild of Paris, you have surgery for myopia.
    Since that day, I have been a particularly annoying halo victim at some point.
    It is true that I have never done routine control since and was a bit lax on tracking.
    But here I would like to find a solution to my problem.
    I read that it would be possible to go into operation to mitigate, to eliminate this problem?
    What do you advise me because I want a "durable" solution.
    Do I have to go back to your office to find out what can be done?

    Well to you.

  7. Martial says:

    Hello, I had surgery in 1992 for my myopia (excimer laser) in one eye and then the next 1 year later.
    Today I am very handicapped by this halo around the light sources and this doubling. The night driving became almost impossible for me. I am 47 years old and do I have to live with this problem? In advance, thank you for your reply. Well cordially
    M Piana

  8. Dr. Damien Gatinel says:

    Treatment issued by the first lasers were of much lower quality than today ' today, profiles and beams, design quality of centering, size of optical zone, etc. Thus, your symptoms are certainly these characteristics. Re-treatment is possible, provided that a medical examination (including topography of the cornea and review aberrometrique) allows to ask an indication, and that this restatement is able to improve the quality of your vision, without disrupting your overall correction.

  9. Dr. Damien Gatinel says:

    You are on the right person, and a balance sheet is quite possible to document the origin of your halos and appreciate the possibilities of a recovery to improve the quality of your vision and reduce the perception of halos.

  10. Martial says:

    Hello Dr. Gatinel and thanks for responding. Your mail is hopeful also can you direct me to a specialist in my area. I live in St Malo (35). In advance, thank you
    Well cordially
    Martial

  11. Leah says:

    Hello
    I was operated more than four years ago, at the age of 20, from my myopia at the Rothschild clinic.
    Spectacular results, I emerge with 10/10 P2 (previously at-4.75) both eyes. But for 2 years, I am more and more embarrassed by the halos by driving at night and also on the screens especially the writings in white on black background. Myopia comes back, I'm at-0.5 currently and I have to put glasses
    In addition I suffer from chronic dry eye..
    My ophthalmologist did not follow me absolutely (except the post op), and even told me that I would not have to see him again. I went to see him last year for my BAV, prescription glasses but absolutely nothing for the halos, this is not his problem...
    Would there be a solution to this situation?
    Kind regards
    Lee C.

  12. Dr. Damien Gatinel says:

    It seems that the return of low myopia is originally from your halos. This recurrence can be linked to the fact that during your operation (at the age of 20), your myopia had not yet completely stabilized, either to local healing phenomena (dry eye is a risk factor for regression). It is theoretically possible to offer a touch-up, provided that the residual corneal thickness is sufficient (the case or a LASIK had been made), and that there are no keratitis or other abnormality of the ocular surface. In general, the halos are related to myopia and also to positive spherical aberration. A reprocessing can be effective both on sharpness in vision from afar, and halos (reduction). It is essential to carry out an assessment specialist with a topographical examination and aberrometrique, as well as a measure of the thickness of the cornea and the LASIK flap.

  13. Tomas says:

    Hello doctor,

    I was operated on cataract soon 20 days ago from the right eye, I saw as and as the passing days, various problems in vision (kind of halos on the end of the eye) that is as if I had the tears that remain in the eye that dazzle. Other times it is a semicircle, especially when I tilt the head to the bottom.
    So hard to work because all the time dazzled by these flashing lights, I feel like seeing rings, in the evening I have a straight and dark line when I turn my head from right to left or the opposite, I had never had this kind of problems.
    Am desperate because the surgeon who operated on me, saw me four days after the operation, did not see anything special, no detachment of the retina (my father had it, and lost the eye it seems it is hereditary) I'm 55 years old.
    I will make an appointment with a ophthalmologist in Paris 8th to see what can be done because I do not want to operate the second eye (left) lest to have these kinds of halos, half circle etc on both sides, because it seems to me that I will no longer be able to work or co Nduire, and may go into a total depression.
    I don't know what to do? As soon as I approach a light, I am dazzled on the side of the eye, as if a background of the eye was made in front of the bulb.
    Moreover, no one has been able to give me information that suggests that we can get by, that it will not remain definitive in my vision
    Well cordially
    Mr Tomas

  14. Dr. Damien Gatinel says:

    Your symptoms are very unusual for an uncomplicated cataract intervention. The perception of half a brilliant circle, in temporal of field of vision, is fairly standard revenge (dysphotopic), but it is intermittent, depends on the presence of a strong side, overall moderate light and does not concern the central field of vision. A second opinion is actually useful to make the point, especially considering the quality of the optics of the placed implant.

  15. Julien says:

    Hello doctor,
    I was operated by the Laser Femtosecond in January 2013 on Bordeaux at the age of 18 years
    I was hyperopic to + 3.25 for the left eye and + 2.5 to the right eye with a slight astigmatie.
    My eyesight was stabilized for many years (I went to the ophthalmologist every year since I was a child).
    The operation went well, I see now very well without a bezel.
    On the other hand, I use rest glasses with a slight correction to work on computer:
    Test November 2014 (ophthalmologist):
    Right eye + 0.50 (+ 0.50 85 °)
    Left eye + 0.75 (+ 0.50 90 °)

    January 2016 (optician) test:
    Right eye: 0.50 (-0.50 165 °)
    Left Eye: + 0.75 (-0.75 5 °)

    On the other hand I have poor night vision, I see bright halos around light sources when the brightness is very low. (On road when it is lit it is fine and when I meet a car no problem of glare) But when he does night and I look in the distance a streetlight I see halos around the light source, similarly when I'm in a dark room and I look at the time on an oven for example I can spot these bright halos around the hour.
    These halos are more or less intense depending on my fatigue. These are kinds of traits that are all around the light source.
    I've had problems with eye dryness that dissipate little by little over time.
    Are there any solutions for my glowing halos? My ophthalmologist had told me that in time it was going to fade away it has been three years since I was operated and I saw only a slight improvement.
    I also see my ophthalmologist in May 2016
    Julien

  16. Dr. Damien Gatinel says:

    The halos are a common side effect after surgery to the hyperopia by LASIK, they do not subside completely. For more information, it is necessary to make an assessment intended to measure accurately the rate of optical aberrations of high degree of your eyes. This measure should quantify the rate of some aberrations, like the spherical aberration. This rate is proportional to the degree of pupillary opening. The pupil dilates to capture more light in low light conditions, and the captured light rays are refracted by more peripheral areas of the cornea, which the optical quality can be degraded. In some case, it may be possible to realize a secondary correction to the resouleveant flap of LASIK laser, to compensate for these halos, but this is based on fine and detailed analysis of the topography of the cornea, the rate of optical aberration, and includes a portion of inaccuracy related to healing of the corneal epithelium.

  17. Julien says:

    Good evening
    Thank you doctor for your answer.
    My halos are still pretty light.
    On the other hand I noticed when there is only a little bit of lighting the halos disappear completely. For driving I increase the illumination of my laptop and it works.
    From the pupillary diameter which becomes smaller.
    Is there an eye drops to reduce the pupillary diameter?
    Julien

  18. Dr. Damien Gatinel says:

    "Alphagan" eye drops to reduce the pupillary dilation in condition of low light, but its effect tends to decrease when it is instilled regularly. Turn on a night light, a ceiling light is certainly just as effective. The pupillary diameter shrinks over time (aging of the eye) which your halos will eventually subside or disappear one day.

  19. Julien says:

    Hello doctor,
    I am suffering from a deep congenital amblyopia of the left eye (with corrective operation of a strabismus at 9 years). During my childhood I was corrected for a hyperopia and a astigmatie for my valid eye which appeared to be "transformed" into slight myopia around 40 years. I am now 45 years old and I have reported to several recoveries the vision of halos at night, initially mainly on the red and blue colors. The halos were small in size and quite similar depending on the distance (as in the photo). This has never seemed to be really taken into account in the consultations. I have noticed a sharp decline in my vision for a few months and for a few days, I notice an accentuation of the phenomenon of halos: all direct light sources create halos at night even when there are many (in town by Example and even the spots of my living room which is thus illuminated) and above all these halos multiply in concentric circles separated by a small space. The farther the source, the more the number and the size of the circles increase up to for example making 3 to 4 concentric circles for car headlights at 100m. These circles decrease in number and size as I get closer to the light source. At 100m, these halos occupy a very important space, giving the illusion of making several meters in diameter. I also feel at times that the image of my computer screen tilts to the left, I find myself very often head bent to the right by watching TV For example (I imagine that the quasi absence of left eye can explain This phenomenon).
    I have just arrived in Brittany, and it is almost impossible to have a cabinet appointment for six months or even to be accepted as a customer. I would like to know if this symptom requires an emergency consultation knowing that I am fairly vigilant about the health of my only valid eye. (For accuracy I spend several hours a day working on a computer screen).
    With all my thanks for your advice and attention

  20. Dr. Damien Gatinel says:

    Only a precise assessment could identify your halos precise optical cause; an aberrometrique review would be particularly appropriate. There is no emergency priori for a check if these halos are permanent and isolated, not associated with an elevation of ocular pressure for example.

  21. Geoffrey says:

    Hello doctor,
    I was operated in 2014 from a myopia by PKR, I remember more exactly how much I had for both eyes-6;-7; My operation went well, my view is excellent..
    Regarding my night vision, I have halos around the light sources when the brightness is very low, my night driving is a bit annoying, especially by car headlights..
    By doing research on the internet, I stumbled upon your site which is well detailed and interesting, you talk about a retouching to rectify the halos, I will be interested to come to Paris (I live on Rennes) to do an examination, my questions are the Following; A recovery to rectify the halos is not too risky for the overall correction?!! Risk becoming hyperopic?!
    Kind regards

  22. Dr. Damien Gatinel says:

    Actually, correction of halos exposes to a slight drift of the correction to the hyperopia. Thus, it is preferentially indicated in patients who also have a slight under correction. For driving at night, you can try to illuminate the passenger compartment of the car (e.g. ceiling light) to induce a slight pupillary constriction and the reduction of the halos.

  23. Antoine says:

    Hello doctor,

    Does one of the two main techniques (LASIK or PKR) expose less than the other to the appearance of persistent halos?

    Thank you very much.

  24. Cuomo says:

    Hello doctor,
    I was operated a week ago from a cataract of the left eye. The view comes back little by little, but every morning I have like a veil in front of the operated eye that fades as the day progresses. What worries me the most is that when I am in the dark or the twilight, there is a line on either side of the light and that is very long, which is a lot to me. Do you think it will pass over time?

  25. Dr. Damien Gatinel says:

    These phenomena are usually transient after the cataract surgery. Regarding the drop in vision when waking up, it can be a slight edema of the cornea.

  26. Dr. Damien Gatinel says:

    For the same correction of myopia, there is no study that showed that PKR or LASIK provided fewer halos. The persistent halos are rare with modern lasers, and mainly concern the strong corrections of myopia (beyond-8 D).

  27. Jeremy says:

    Hello doctor,
    I got the myopia (Laser Excimer) in 2003, and since then I have more marked halos on one eye (left eye) than the other. I would like to know if a retouching is possible or ophthalmic drops, because in 2003 I imagine that the lasers were less efficient.
    Then it may be silly but I did an all-beast experiment with a pair of binoculars on my left eye. By adjusting the clarity dial of the binocular, it corrected the sharpness of my vision, especially that I suppress the halos (the day because in the evening the binoculars are useless).
    So I inferred that either the corneal flap was badly repositioned, or it is the technique of the time when reading your articles.
    But in all case is what it can be corrected, because it gene me, and in the end it removes me 2 or 3/10 of vision because of these halos.
    Thank you for your answers

  28. Marcel de Nadaï says:

    Hello doctor,

    I was operated on the cataract of the right eye two months ago. I had an edema of the cornea that has resorbed well, and I have so far recovered a good vision at 10/10.
    On the other hand, 15 days after the operation appeared light aberrations in a context of dusk or night. Diagonals around light sources such as car headlights, ceiling lights. This then disappeared for 10 days. Abruptly, this came back, with in addition to the light halos located to the right of the light source... Television, computer, bedside lamp... I reported all this to my surgeon, and asked him for a Aberrometry , he told me that it would not bring information. And that my brain would hardly get used to these phenomena... So I stay a little disoriented and dissatisfied, with my flashes and halos parasites at night... What should I do?

    In advance thank you for giving me an opinion

  29. Dr. Damien Gatinel says:

    The phenomena you are talking about probably have an optical origin. It is difficult to clarify the cause without clinical examination (examination of implant localization) and aberrometric. Various causes can a priori be evoked: slight shift! tilt of the implant, presence of folds of the posterior capsule, alteration of the surface of the implant, etc.

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