It's utilized to gauge eye misalignment in patients which can't coordinate for cover test or who have poor obsession. The analyst sparkles the light and looks at the corneal light reflex. Typically the corneal light reflex is somewhat nasal to the focal point of cornea.
On the off chance that the corneal light reflex is seen transiently then that eye is veered off nasally (esotropia) and if corneal light reflex seen nasally that eye is digressed transiently (exotropia).
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