OPD: Beginner cataract
A patient has a feeling of decreased vision in one eye (right eye), while his acuity without correction 10/10 and 12/10 with a very slight correction ofastigmatism myopic: plan (-0.25 x 0 °). The patient reported a few symptoms compatible with those of a debutante cataract (glare, difficulties in against day).
Examination to the lamp (biomicroscope) slot, there is a discreet opalescence of the center of the lens (nuclear opalescence) of the right eye.
The aberrometrique survey with the OPD SCAN 3 shows that there is a slight elevation of the optical irregularity, seemingly original internal, since the cornea does not have irregular astigmatism (red box).
It was noted that the quality of the stigma (maps of the) PSF (: Point Spread Function, framed black and white next to the maps in color) is less in terms of the internal dioptres for the cornea.
An expansion of these images confirms it:
To better interpret them, we can overlay the mosaic of photoreceptors (cones) in the image of bright sprawl (at the bottom of the image above): we found that the spatial extension of this light spread (PSF) is low, which allows a good resolution, but results in a lower contrast of the retinal image.
The study of fluctuations of the refractive power shows a slight "myopisation" Central: it is certainly induced by an increase in the refractive index of the lens (index myopia) that often accompanies the appearance of cataract.
This suggests the beginner cristalliniennes opacities responsibility in the genesis of these disorders: it is a "pre cataract", or a beginning of nuclear cataract. There is no formal operative indication due to the gene that is moderate, and the preservation of Visual acuity. A measure of the light distribution (collection of the OSI: 'Optical Scatter Index', performed with the instrument) OQAS) is indicated: this technology allows to objectify the effects of the loss of transparency of the lens on the Visual function (see article on) indicators provided by the OQAS and cataract)