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profile of ablation

Custom corrections

Custom corrections are adapted to certain characteristics of the eyes operated by laser refractive surgery. They are not limited to the consideration of the optical formula to be corrected (example: Myopia of-3 D) but are intended to establish a tailor-made "correction pattern". Taking into account the asphéricité of the [...]

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Profile of ablation: compound astigmatismes

Compound astigmatism correction depends on the type of astigmatism, and its association with myopia or a farsightedness. Astigmatismes composed the astigmatismes compounds, or sphero-cylindrical ametropia composed, include:-l' compound myopic astigmatism (AMC): ex - 2(-3×90°): all corneal meridians are "short-sighted" (their degree of myopia vary between two extremes: in the example [...])

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Profile of ablation: hyperopique simple astigmatism

In the presence of a pure hypermetropique astigmatism, the ablation profile must include the increase of corneal camber global, selective according to the affected meridians. Hypermetropique astigmatism - for example: plan (+ 1 × 90 °): the meridians are all (except one, the one located at 90 °) insufficiently arched. This lack of camber varies less arched Meridian to the Meridian [...]

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Profile of ablation: correction of hyperopia

Surgical correction by photoablation laser of simple hyperopia (without astigmatism) is based on the issuance of a profile of ablation which aims to increase the curvature of the corneal profile (reduction of the radius of curvature). The profile of ablation has an optical (lens correction) area and an ablation zone, particularly important in case of surgery to the hyperopia. -Zone [...]

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Profile of ablation: correction of myopia

The correction by photoablation excimer laser to correct nearsightedness simple (without astigmatism) is based on the issuance of an ablation profile intended to reduce the curvature (and thus the optical power) of the cornea. The profile of ablation is issued on a so-called zone of ablation: this area includes the optical zone where is made the correction, and [...]

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Munnerlyn

Charles Munnerlyn is an American optical engineer born in 1940. He designed the first excimer laser for the correction of myopia in 1985. He gave his name to a formula for estimating the depth of maximum removal (P) of a refractive treatment, from the number of processed diopters (D), and [...]

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Gatinel D, Hoang Xuan T. Geometric customization of optical and transition zone parameters for the treatment of compound myopic astigmatism with the NIDEK EC-5000 excimer laser

J Refract Surg. 2007; 23 (9): 924 - 30 this article illustrates the interest of optimization of the geometry of the optical zones and transition in myopic astigmatism LASIK treatment. Optical and oval or elliptical edge transition areas provide better refractive outcomes. Download article: Geometric customization of Optical and Transition Zone [...]

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