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At both testing distances the patient is required to wear red-green goggles (with one red lens over one eye, usually the right, and one green lens over the left) When performing the test at far (distance) the W4LT instrument is composed of a silver box (mounted on the wall in front of the patient), which has four lights inside it.
Cotton wool spots are commonly caused by changes to the retina secondary to diabetes, hypertension, or blockages to blood vessels to the retina, such as central retinal vein occlusion. [ 5 ] [ 8 ] While at one point believed to have been the result of nerve damage in the retina, interruptions to axoplasmic flow to these nerves may result from ...
Eye patching is used in the orthoptic management [2] of children at risk of lazy eye (), especially strabismic or anisometropic [3] amblyopia. These conditions can cause visual suppression of areas of the dissimilar images [4] by the brain such as to avoid diplopia, resulting in a loss of visual acuity in the suppressed eye and in extreme cases in blindness in an otherwise functional eye.
The BSGT is used for patients with strabismus to test for suppression, normal retinal correspondence or abnormal retinal correspondence, [2] particularly in cases of manifest strabismus. [3] The Bagolini Striated Glasses Test is the test most likely to allow the demonstration of fusion in patients who fuse intermittently.
The numerical display represents raw values of patient's retinal sensitivity at specific retinal points in dB. Higher numbers equate to higher retinal sensitivities. Sensitivity is greatest in the central field and decreases towards the periphery. Normal values are approximately 30 dB while recorded values of <0 dB equate to no sensitivity ...
This test is performed on patients suspected to have small angle deviations of less than 10 prism dioptres, a microtropia, that may or may not have been observed on cover test because of subtle eye movements. The test determines whether the patient has bifoveal fixation or monofixation despite their eyes seeming straight.
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The angiography test will usually show one or more fluorescent spots with fluid leakage. In 10%-15% of the cases these will appear in a classic smokestack shape. [citation needed] Differential diagnosis should be immediately performed to rule out retinal detachment, which is a medical emergency. A clinical record should be taken to keep a ...