Is perception of light useful to the blind patient?

BLINDNESS AFFLICTS more than 1 million Americans, 10% of whom have no conscious perception of light.1 The most rudimentary form of vis ion is the ability to see light. In the ancient oceans, life forms developed faint patches of skin that were sensitive to light. They could tell light from dark and the direction of the light source but that was all. Phototropism in organisms from Amoeba to Drosophila may represent the elemental form of light perception in our biological roots.2 Presumably, these ancient ancestors found some value and usefulness in light Citat ions 12

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