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The prism cover test (PCT) is an objective method to measure ocular misalignment or strabismus. It involves using prism bars, occluder and targets to neutralise the deviation and record the angle and base of the prism.
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.
It repeated for both eyes. Four-base-out is a distance method because suppression scotomas in micro-strabismus is usually small and by using a near target, the examiner might cause the image of the target to land outside of said suppression zone and any signs of micro-strabismus or monofixation might be masked. [citation needed]
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.
Strabismus, or crossed eyes, occurs when the eyes point in different directions. This can cause the brain to see two images or double vision. Coloboma involves missing eye tissue.
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 Worth 4 dot test is a clinical test for assessing binocular vision and eye alignment. It involves wearing red-green goggles and seeing four lights in a diamond formation, which can indicate normal or abnormal fusion, suppression, or diplopia.
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.