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Photostress recovery time measurement procedure is known as photostress test. Normal recovery time is about 15–30 seconds. [1] The photostress test is a simple, easy and quick clinical technique that can differentiate between retinal and postretinal (e.g.optic nerve) disease. [2]
Glare can be generally divided into two types, discomfort glare and disability glare. [1] Discomfort glare is a psychological sensation caused by high brightness (or brightness contrast) within the field of view, which does not necessarily impair vision. [2]
Techniques used to perform this test include the confrontation visual field examination (Donders' test). The examiner will ask the patient to cover one eye and stare at the examiner. Ideally, when the patient covers their right eye, the examiner covers their left eye and vice versa.
Requires a higher level of patient understanding and concentration compared to other visual field tests [9] Time-consuming; Learning effect: new patients improve as more tests are performed due to understanding of the test conditions. Consider the third test as the baseline result [23] Potential for artefacts (i.e. uncharacteristic vision loss ...
Veiling glare in a photograph from Cassini (spacecraft) Veiling glare caused by stray light reflecting inside the camera or scattering in the lens. Veiling glare is an imperfection of performance in optical instruments (such as cameras and telescopes) arising from incoming light that strays from the normal image-forming paths, and reaches the focal plane. [1]
Anti-reflective coatings are used in a wide variety of applications where light passes through an optical surface, and low loss or low reflection is desired. Examples include anti-glare coatings on corrective lenses and camera lens elements, and antireflective coatings on solar cells. [2]
The Bruckner test differs in that one will visualize both eyes simultaneously. Unlike the red reflex, this can help determine if the patient has normal ocular alignment. In order to perform this test the patient and physician are normally approximately 2 to 3 feet away from each other. [7]
A single sheet of Glare may be referred to using the naming convention GLARE grade - Aluminum layers / Glass fiber layers - Aluminum layer thickness. The number of aluminum layers is always one more than the number of glass fiber layers, and the aluminum layer thickness is in millimeters, which can range from 0.2 to 0.5 mm (0.0079 to 0.0197 in ...