The Number-One Cause of Blindness for Those in Developing Countries

The number-one cause of blindness for those in developing countries is __________ because people in these countries __________.

A) cataracts; rarely have access to corrective surgery
B) macular degeneration; do not have access to medications used to treat it
C) glaucoma; smoke more cigarettes than those in developed countries
D) eye infection; eat a diet high in fatty foods