Incomitancy refers to a deviation that changes with gaze. Which statement best describes its clinical significance?

Incomitancy refers to a deviation that changes with gaze. Which statement best describes its clinical significance?

• A. The deviation changes with gaze and affects prism management
• B. The deviation remains constant across gazes
• C. It has no impact on treatment
• D. It is only seen in children

Answer: (A)

Incomitancy means the misalignment changes when the eyes look in different directions. This matters clinically because prisms are used to neutralize a deviation, but a prism that corrects the angle in one gaze may over- or under-correct in another. So, you need to assess the angle in multiple gaze positions and tailor prism use to the gaze where the deviation is worst, or plan treatment that accounts for the changing angles. Incomitancy also often points to a motor issue—such as a nerve palsy or a mechanical restriction—which may require further evaluation or different management beyond a single, fixed prism. The idea is that the deviation is not constant across gazes, and that reality guides how you approach treatment.

Incomitancy means the misalignment changes when the eyes look in different directions. This matters clinically because prisms are used to neutralize a deviation, but a prism that corrects the angle in one gaze may over- or under-correct in another. So, you need to assess the angle in multiple gaze positions and tailor prism use to the gaze where the deviation is worst, or plan treatment that accounts for the changing angles. Incomitancy also often points to a motor issue—such as a nerve palsy or a mechanical restriction—which may require further evaluation or different management beyond a single, fixed prism. The idea is that the deviation is not constant across gazes, and that reality guides how you approach treatment.