Hirschberg's test is measured under which conditions?

• A. Monocular conditions
• B. Binocular conditions
• C. Both monocular and binocular
• D. Not measured

Answer: (B)

Hirschberg's test measures ocular alignment by comparing the corneal light reflex in each eye while both eyes are open and fixating on a target. Because it relies on how the two eyes work together in binocular viewing, it must be performed under binocular conditions. If one eye is covered or tested monocularly, the reflex positions no longer reflect true alignment of the two eyes, making the estimate unreliable. In practice, a small shift of the light reflex from the pupil center indicates deviation, and clinicians use this binocular reflex pattern to estimate the degree of misalignment.