Jamal was born with eye muscles that made his eyes excessively converge, resulting in a "cross-eyed" condition.Although he had corrective surgery at age 7, his vision was never what would be considered normal.This is an example of a(n):

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The fact that Jamal's vision was never considered normal even after corrective surgery suggests that his visual system may have undergone irreversible changes during development. This is consistent with a critical period effect, which refers to a specific period during development when an organism is particularly sensitive to environmental input, and after which certain developmental outcomes may become fixed or difficult to modify. The fact that Jamal had corrective surgery also suggests that his condition may have been identified during a sensitive or plastic period, when interventions are more likely to be effective. However, the lasting effects on his vision suggest that there may have been a critical period during which his visual system was particularly vulnerable to the effects of his eye muscles, and after which his vision was permanently affected.

Jamal Was Born with Eye Muscles That Made His Eyes