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Thinning of the retina and retinal, pigment epithelium in the region immediately surrounding the optic nerve head. This can be seen in a number of pathologic and benign conditions.

A condition of “light adaptation” that is used in retinal testing such as the electroretinogram. Light adaptation is accomplished by exposing a patients eyes to diffuse light of moderate intensity several minutes. This can be useful for determining the health of “cones,” the fine detail and color perceiving cells in the retina.

Thickening of the lens capsule following cataract surgery. This is a healing response, which in some people may be sufficient to reduce the vision and require laser treatment to make an opening in the capsule at some point after cataract surgery.