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Worth 4 dot test

    The '''Worth 4 dot test''' (also known as the Worth dot test) is a clinical test for suppresion of either the right or left eye Suppression occurs during binocular vision when the brain does not process the informaion received from either of the eyes This is a common adaption to strabismus amblyopia and aniseikonia
    During the Worth 4 Dot test the patient wears anaglyphic glasess (with one red lens over one eye usually the right and one green lens over the other eyeusually left) The patient is shown an adapted flashlight with four holes approximately 1cm in diameter organized in a diamond shape Traditionally the holes are orginized in this fashion: the top hole shows only red light the left and right show only green light and the bottom shows white light
    Because the red filer blocks the green light and the green filter blocks the red light it is possible to determine if the patient is using both eyes simulataneously in a coordinated manner With both eyes open a patient with normal binocular vision will apperciate four lights If the patient either closes or suppresses an eye they will see either two or three lights If the patient does not fuse the images of the two eyes they will see five lights

    See also

    • Eye examination
    • Diplopia


    • Eskridge JB, Amos JF, Bartlett JD. Clical procedures in Optometry Lippincott Co. New York 1991