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Yet the private account may not contain enough money for the monthly benefits that Social Security provides to widows and surviving children . " Previous studies had implicated excessive exposure to UV-B radiation in actinic keratitis , an inflammation of the cornea - - the transparent , slightly curved tissue that focuses light entering the eye - - also called snow blindness . And we had a series of meetings back at that time with the industry . Also called " index shares , " they have grown tremendously in popularity since they started in 1993 . " The researchers conducted a detailed cost-analysis of 145 heart transplant patients over a 10-year period , and found that overall heart transplants are somewhat more expensive than other widely used medical procedures such as kidney dialysis .