USMLE® Step 1 style questions USMLE
USMLE® Step 2 style questions USMLE
A two-year-old girl is brought to her pediatrician for a routine well-child checkup. She can walk up stairs and speak two-word sentences and answers questions. She is in the 80th percentile for weight and 76th for height. Her physical exam findings are all healthy and normal. During her ophthalmological exam, her eyes are seen to be pointed in different directions. When a flashlight is shown into her eyes, the physician notes the reflex seen in the photograph below. Which of the following principles could potentially explain this finding?