Dr. Arnall Patz dies at 89; helped eliminate major cause of blindness

In one of the first clinical studies, Patz found that excess oxygen given to premature babies in incubators led to a disease that causes blindness; he later received a Presidential Medal of Freedom. Dr. Arnall Patz, a Johns Hopkins University physician who discovered and eliminated a major cause of blindness in children, died Thursday of heart disease at his home in Pikesville, Md....

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