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A 10-month-old girl is brought by her mother, who has noticed that in photographs taken with a flash the left pupil looks white while the right glows red. The girl was born at 39 weeks after an uncomplicated pregnancy, and her red reflexes were recorded as normal at the newborn and six-week checks. Both eyes are the same size with clear corneas, she is not photophobic, the eyes are white and comfortable, and she is otherwise well and thriving. Which one of the following is the most likely cause of the white pupil?
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