The Hirschberg test (also known as the corneal light reflex test) is a quick and simple way to check ocular alignment. This assessment is particularly useful for testing for strabismus (misalignment of the eyes) in newborns, young children, patients with poor vision, patients that are not able to fixate or track well – or in any situation where a full motility evaluation is not feasible. The Hirschberg test is based on the premise that 1 mm of decentration of the corneal light reflection corresp