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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 prism cover test (PCT) is an objective method to measure ocular misalignment or deviation of the eye. It involves using prism bars, occluder, and targets to neutralise the deviation and record the angle and base of the prism.
Eye glasses with an included prism power is the optical method to reduce a fixation disparity. Different procedures have been proposed to determine the required amount of prism for the individual. Based on prism-FD curves (Fig. 3b), one can find the aligning prism sP 0 that nullifies the naturally prevailing fixation disparity sFD 0. This test ...
The Hirschberg test, also known as the Hirschberg corneal reflex test, is a method to assess ocular misalignment by observing the light reflex on the cornea. It can detect exotropia, esotropia, hypertropia or hypotropia and is used in optometry and ophthalmology.
Hypertropia is a condition of misalignment of the eyes, where one eye is higher than the other. It can be congenital or acquired, and may lead to amblyopia, diplopia or cosmetic defect. Learn about the possible causes, diagnosis and surgical options for hypertropia.
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