American Board of Opticianry (ABO) Practice Test 2025 - Free ABO Practice Questions and Study Guide

Question: 1 / 400

Exotropia might be corrected with base in which direction?

In

When addressing exotropia, which is a type of strabismus where one or both eyes turn outward, the correction typically involves the prismatic effect of glasses. The appropriate direction for the base of the prism to be placed is towards the nose, also referred to as "base in." This creates an optical effect that encourages the eyes to converge as opposed to diverging, effectively helping to align the eyes more centrally.

Placing the base of the prism "in" compensates for the outward deviation of the eyes by promoting inward movement. In contrast, options suggesting upward or downward adjustment do not directly address the lateral position of the eyes, while placing the base "out" would not provide the needed corrective action for someone experiencing exotropia. Thus, the strategic placement of the prism with the base inwards directly works to correct the outward deviation characteristic of this condition.

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