I found information at www.cataractsurgery.com on what Posterior Subcapsular Cataracts is, and they state "Because light converges at the back of the lens (the posterior pole) as it moves through the eye, a posterior subcapsular cataract affects vision even more than other types of cataracts. Anything that causes our pupils to constrict, such as bright light or the convergence of the eyes for reading, makes it very difficult for people with this type of cataract to see. "
Jennifer Richardson
www.richardsonstudios.com
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