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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.
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.
Maddox wing is an instrument for measuring strabismus (eye misalignment) by dissociating the eyes with septa and arrows. Learn about its indications, equipment, method, interpretation, advantages, disadvantages and considerations.
Esophoria is an eye condition involving inward deviation of the eye, usually due to extra-ocular muscle imbalance. It is a type of heterophoria and can be caused by refractive errors, divergence insufficiency or convergence excess.
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.
The budgeted cost of the COSTAR was US$50,000,000. [5] To fit the COSTAR system onto the telescope, one of the other instruments had to be removed, and astronomers selected the High Speed Photometer to be sacrificed, which was the least important of the four axial detectors.
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.
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