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A prism cover test is a method to measure strabismus, or eye misalignment, by using prism bars and an occluder. It involves performing an alternate cover test with different prism strengths until the deviation is neutralised.
A cover test or cover-uncover test is an eye examination to measure ocular deviation. Learn about the alternating and unilateral cover tests, the fixation targets, the characteristics of strabismus and the practical application of the test.
Strabismus, also known as crossed eyes or squint, is a condition where the eyes do not point at the same object. It can cause double vision, amblyopia, and psychosocial problems. Learn about the types, causes, diagnosis, and treatment of strabismus.
Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.
The Hirschberg test is a screening test for strabismus (ocular misalignment) that uses a light and a cornea reflex. It was developed by German ophthalmologist Julius Hirschberg in 1886 and can be used to quantify strabismus with a photographic version.
Olympian Stephen Nedoroscik, aka “The Pommel Horse guy,” is living with two eye conditions, strabismus and coloboma. Strabismus, or crossed eyes, occurs when the eyes point in different ...
The Maddox rod test is a subjective method to measure horizontal and vertical deviations of the eyes, using a red line and a white light. The double Maddox rod test can also assess torsion and cyclotropias, by comparing the angles of two red lines.
The patient wears red-green glasses, and two lights (one red, one green) are used, so that the patient thus sees each light with a different eye. One light is held by the clinician, the other by the patient. The clinician points the light to a screen, requesting the patient to bring the second light to align on top of it.