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The Endowment for Human Development
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Response to Light


6 months, 2 weeks

From The Biology of Prenatal Development.Buy Now

Script: By 26 weeks the eyes produce tears.

The pupils respond to light as early as 27 weeks. This response regulates the amount of light reaching the retina throughout life.

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
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