What is used to measure the misalignment of the eyes?

The Hirschberg Test is commonly used to assess the alignment of the eyes by examining the reflection of light on the cornea. When a light source is directed at the eyes, it creates reflections on the cornea, known as corneal light reflexes. Observing the positioning of these reflections in relation to the pupils indicates whether the eyes are aligned properly. If the reflections are not symmetric, it suggests an ocular misalignment, such as strabismus.

This test is particularly useful in a clinical setting for quickly determining eye alignment without the need for extensive equipment. Its simplicity and effectiveness make it a standard procedure in the evaluation of eye misalignment, especially in children.

Other tests mentioned, while related to eye examination, have different primary purposes. For example, the Cover Test evaluates ocular alignment by occluding one eye and observing the other, but it is more of a confirmatory test rather than a primary measurement tool for misalignment. The Bruckner Test assesses for strabismus and amblyopia indirectly through pupillary reflexes. Meanwhile, a Visual Acuity Chart measures clarity of vision rather than alignment. Thus, the Hirschberg Test stands out for explicitly measuring eye alignment based on corneal light reflex evaluation.