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Individuals with nystagmus, Duane's retraction syndrome, 4th Nerve Palsy, and other eye movement disorders experience an improvement in their symptoms when they turn or tilt their head. Yoked prism can move the image away from primary gaze without the need for a constant head tilt or turn. [1] Prism correction is measured in prism dioptres. A ...
Strabismus is an eye disorder in which the eyes do not properly align with each other when looking at an object. [2] The eye that is pointed at an object can alternate. [ 3 ] The condition may be present occasionally or constantly. [ 3 ]
The prism cover test (PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists, orthoptists, and optometrists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]
Strabismus, or crossed eyes, is when the eyes point in different directions, which can affect vision. One eye may look straight ahead while the other turns up, down, in, or out.
The room or location of the test should be brightly illuminated and the patient's optical correction (e.g. glasses, bifocals, multifocals, contact lens) is required to be worn. In the event that correction cannot be worn due to the obstruction of vision through the eye piece, lenses may be placed within the lens holder before each eye.
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