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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.
Learn about the surgical options to correct the misalignment of the eyes caused by strabismus, a condition that affects the extraocular muscles. Find out how the procedures are performed, what indications they have, and when they were first developed.
Diplopia is the simultaneous perception of two images of a single object, which may be voluntary or involuntary. It can result from various ophthalmologic, neurological, or systemic disorders, and can be classified as monocular or binocular, acute or chronic, and suppressed or not.
During an eye examination, the presence of suppression and the size and location of the suppression scotoma may be the Worth 4 dot test (a subjective test that is considered to be the most precise suppression test), or with other subjective tests such as the Bagolini striated lens test, or with objective tests such as the 4 prism base out test.
Hypertropia is a type of strabismus where one eye is higher than the other. It can be congenital or acquired, and may affect binocular vision, cosmetics and amblyopia. Learn about the possible causes, diagnosis and surgical options for hypertropia.
Cyclotropia is a form of strabismus in which one or both eyes are tilted relative to each other. Learn about its diagnosis, treatment, and causes, such as vascular disorders or surgery.
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.
Strabismus is a vision disorder in which the eyes do not align properly when looking at an object. It can cause double vision, amblyopia, and psychosocial difficulties. Learn about the symptoms, diagnosis, treatment, and history of strabismus.