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[3] Swiss ophthalmologist Marc Amsler described the Amsler grid in the year 1945. It was the first functional test proposed to evaluate metamorphopsia. [4] He may have gotten the idea of the grid from Edmund Landolt, who used a similar small card with a grid pattern to be kept in the center of the visual field testing instrument perimeter. [3]
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A comfortable viewing distance is also one at which the angle of view is approximately 60°; [7] at a distance of 25 cm, this corresponds to about 30 cm, approximately the diagonal of an 8-inch × 10-inch image (for comparison, A4 paper is 8.3 in × 11.7 in, 210 mm × 297 mm; US Letter paper is 8.5 in × 11 in, 216 mm × 279 mm). It often may ...
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[27] [4] [28] [dubious – discuss] The blind spot is at about 15.5° in the outside direction (e.g. in the left visual field for the left eye). [ 29 ] The grain of a photographic mosaic has just as limited resolving power as the "grain" of the retinal mosaic .
In the 1980s, Jazz musician and composer Henry Butler, who was blind from infancy, experimented with photography; his work was published in various art galleries and events in 1985. [3] Seeing With Photography Collective, a group of blind and visually impaired photographers based in New York, was established in the early 1990s. [4]
In optics and photography, hyperfocal distance is a distance from a lens beyond which all objects can be brought into an "acceptable" focus. As the hyperfocal distance is the focus distance giving the maximum depth of field, it is the most desirable distance to set the focus of a fixed-focus camera . [ 41 ]
The blind spot can also be assessed via holding a small object between the practitioner and the patient. By comparing when the object disappears for the practitioner, a subject's blind spot can be identified. There are many variants of this type of exam (e.g., wiggling fingers in the visual periphery on the cardinal axes).