American Board of Ophthalmology (ABO) Practice Exam

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Excessive base down prism OU can create which of the following sensations?

Feeling of walking on flat ground
Feeling of walking down a hill
Dizziness when standing
Headaches

The correct answer is: Feeling of walking down a hill

Excessive base down prism creates a unique visual perception in patients because it alters how objects in the visual field are perceived in relation to gravity. When there is an excess of downward displacement in the image due to base down prism, it can give the sensation of walking down a hill. This occurs because the brain interprets the altered visual input as a change in orientation relative to the ground, leading to the feeling of descending rather than being on level ground. This context helps to understand why patients might feel the sensation of being on a slope when excessive base down prism is applied, as the visual input does not match the physical environment. The other sensations mentioned may occur with different kinds of prism or visual disturbances, but they are not specifically created by excessive base down prism.