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The prism cover test (PCT) is an objective method to measure ocular misalignment or strabismus. It involves using prism bars, occluder and targets to neutralise the deviation and record the angle and base of the prism.
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.
The Hirschberg test is a screening test for strabismus (ocular misalignment) that uses a light and a cornea reflex. It was developed by German ophthalmologist Julius Hirschberg in 1886 and can be used to quantify strabismus with a photographic version.
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.
A doublet prism, showing the apex angles (and ) of the two elements, and the angles of incidence and refraction ′ at each interface. The deviation angle of the ray transmitted by the prism is shown as δ {\displaystyle \delta } .
Stereopsis is the component of depth perception retrieved through binocular vision, which occurs when each eye receives a different image due to their slightly different positions. Learn about the types, mechanisms, and applications of stereopsis, as well as the factors that affect and measure it.
Exotropia is a form of strabismus where the eyes are deviated outward, causing crossed diplopia and loss of binocular vision. Learn about the signs, symptoms, causes, and treatment options for exotropia, such as glasses, patching, exercises, surgery, and vision therapy.
Learn how to perform and interpret the Bagolini striated glasses test, a clinical test to detect binocular functions and strabismus. See the equipment, principles, indications, method, results and advantages of this test.