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Hirschberg test
In the fields of optometry and ophthalmology, the Hirschberg test, also Hirschberg corneal reflex test, is a screening test that can be used to assess whether a person has strabismus (ocular misalignment).
A photographic version of the Hirschberg is used to quantify strabismus.〔Eskridge JB, Wick B, Perrigin D. "The Hirschberg test: a double-masked clinical evaluation." ''Am J Optom Physiol Opt.'' 1988 Sep;65(9):745-50. PMID 3056019.〕
==Technique==
It is performed by shining a light in the person's eyes and observing where the light reflects off the corneas. In a person with normal ocular alignment the light reflex lies slightly nasal from the center of the cornea (approximately 11 prism diopters -- or 0.5mm from the pupillary axis), as a result of the cornea acting as a temporally-turned convex mirror to the observer. When doing the test, the light reflexes of both eyes are compared, and will be symmetrical in an individual with normal fixation. For an abnormal result, based on where the light lands on the cornea, the examiner can detect if there is an exotropia (abnormal eye is turned out), esotropia (abnormal eye is turned in), hypertropia (abnormal eye higher than the normal one) or hypotropia (abnormal eye is lower than the normal one).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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