You may notice that it has become more painful to walk out into bright sunlight or see exaggerated glare off of reflective surfaces like windshields. A cataract that develops at the back the eye's lens can make the eye especially sensitive to bright light.
Because light converges at the back of the lens (the posterior pole) as it moves through the eye, a posterior subcapsular cataract, which begins at the back of the lens and spreads to the periphery or edge of the lens, affects vision even more than other types of cataracts.
If you have a posterior subcapsular cataract, anything that causes your pupil to constrict, such as bright light or the convergence of the eyes for reading, makes it very difficult for you to see. Unlike people with nuclear cataracts, people with subcapsular cataracts often benefit from the use of dilating drops to keep the pupils large and thus allow more light into their eyes.
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