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An afferent pupillary defect is an eye condition where one eye is less sensitive to light, and will not contract as sharply in response to light as the unaffected eye.This can be a sign of optic nerve damage, tumor, glaucoma, and a number of other eye issues.n afferent pupillary defect may be a sign of damage to the optic nerve. An afferent pupillary defect may be a sign of glaucoma or other eye conditions.
What is my Pupil Distance (Pupillary Distance or PD)? The Pupil Distance or otherwise known as Pupillary Distance (PD) is the distance between your two pupils, measured in millimeters (mm). This measurement is required for us to center the lenses correctly in the glasses/goggles so that you are looking through the center of the lenses.