The Hirschberg test provides an objective estimate of the angle of a manifest squint by measuring the deviation of the corneal light reflex from the center of the pupil in the squinting eye when the patient fixates on a point light held 33cm away. Each millimeter of deviation roughly equals 7 degrees of squint, with 15 degrees indicated if the light reflex reaches the pupil border and 45 degrees if it reaches the limbus.

2. HIRSCHBERG TEST
It gives rough objective estimate of the angle of a manifest squint.
Useful in young or uncooperative patients or when fixation in deviating
eye is poor.

3. PROCEDURE
 HERE the patient is asked to fixate at point light held at a distance of 33cm
and the deviation of the corneal light reflex from the centre of pupil is noted
in the squinting eye.
 Each mm of deviation is approximately equal to 7 degree. (1 degree= 2 prism
dioptre)
 The angle of squint is 15 degrees & 45 degrees when the corneal light reflex
falls on the border of pupil and limbus, respectively.

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