What is a common symptom of excessive base up prism in patients?

Excessive base up prism can lead to a visual phenomenon known as "size distortion," where patients perceive objects as shorter than they actually are. This distortion occurs because the base up prism shifts the visual field, affecting depth perception and spatial orientation. When the prism is too strong, it can create an exaggerated effect on the perceived height of objects, leading to the feeling that they are not as tall as they should be.

Although other symptoms such as feeling of floating, visual fatigue, and difficulty reading can occur with various types of prism adjustments and visual strain, they are not as directly related to the specific effects of excessive base up prism. This symptom of perceiving objects as shorter highlights a unique interaction between the prism effect and visual processing, making it a key indicator for practitioners assessing prism prescriptions.