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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.
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.
Convergence insufficiency is a binocular vision disorder that affects the ability of the eyes to turn towards each other. It can cause symptoms such as double vision, eye strain, headache, and difficulty reading. Learn about the diagnosis, treatment, and prevalence of convergence insufficiency.
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.
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.
Vergence is the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision. Learn about the different types of vergence, such as convergence, divergence and fusional vergence, and the common vergence dysfunctions that affect eye alignment and vision.
Horror fusionis is a rare condition and normally appears only in patients who have been treated by means of surgery or other interventions. [2] Attempts to achieve stereoscopic vision, in particular anti-suppression therapy and other orthoptic exercises, may lead to double vision as undesired side effect, in particular also to horror fusionis.
Ophthalmology is a medical specialty that deals with the diagnosis and treatment of eye disorders. An ophthalmologist is a physician who undergoes subspecialty training in medical and surgical eye care. Learn more about the history, diagnosis, surgery, and subspecialties of ophthalmology.
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