The most common cause of curable blindness in the United States is:
A. macular degeneration.
B. cataracts.
C. retinal detachments.
D. glaucoma.
E. trauma.
Answer: D, glaucoma
Again, the wording is difficult in this question. Macular degeneration, retinal detachments and trauma are not preventable. Cataracts are "curable", but the cataract itself is probably not "preventable". Chronic glaucoma can be treated to prevent blindness this is a matter of semantics.
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If you are studying for the PANCE or the PANRE I recommend these Review Books.