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CATARACT
The aging of the crystalline lens, which gradually becomes opaque as a result. The crystalline lens is then removed and can be replaced by an intra-ocular lens (i.e. an implant).
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COATED SURFACE
An optical surface made of glass that has been coated with one or more thin, transparent layers in order to reduce losses from reflection and ghost images.
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CONE
The photoreceptor cells on the retina used during photopic vision to see colours and details
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CONTRAST
The difference in the characteristics of two visual impressions that are juxtaposed in space or time (lighting contract, colour contrast, simultaneous or successive contrast). |
CONVERGENCE
The reflex ability of the eyes to focus simultaneously on a single point in near vision. |
CORNEA
The very thin, transparent, dome-shaped covering on the front portion of the eyeball. (see EYE) |
CRYSTALLINE LENS
An optical lens located behind the iris, responsible for ensuring that images converge on the retina and appear in focus. (see EYE) |
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