More and better incubators were just what the doctors ordered, and by the late 1930s a steadily increasing number of premature babies was surviving the dangerous weeks after birth. But by 1942, medical statisticians were already calculating the cost. Of premature babies who weighed 4 Ibs. or less at birth, one out of every eight reared in hospital incubators was going blind. Suddenly, and for no apparent reason, the blood vessels of the retina would fan out in wild profusion. Fibrous tissue growing behind the lens would cloud the eyes and ruin the retina. Doctors were baffled. They could do little...
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