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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.
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.
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.
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.
Exophoria is a tendency of the eyes to deviate outward, usually mild and with fusion possible. It can be caused by refractive errors, divergence excess, or convergence insufficiency, and is common in infancy and childhood.
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.
Heterophoria is an eye condition where the eyes are not straight at rest position, but can be aligned by fusion. Learn about the types, signs, symptoms, causes, diagnosis and treatment of heterophoria.
Learn the meaning of various abbreviations used by optometrists to denote clinical conditions, examination techniques and findings, and treatment methods. The list covers terms related to eye examination, visual acuity, visual field, and clinical conditions.