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The Amsler grid showing the visual perception of the left eye of a person experiencing metamorphopsia (straight lines appear bent or curved) [1] [2]. Metamorphopsia (from Ancient Greek: μεταμορφοψία, metamorphopsia, 'seeing mutated shapes') is a type of distorted vision in which a grid of straight lines appears wavy or partially blank.
Patients with macular disease may see wavy lines or some lines may be missing. Amsler grids are supplied by ophthalmologists, optometrists or from web sites, and may be used to test one's vision at home. The original Amsler grid was black and white.
They follow a V shape over the back, S-shaped whirls over the chest and sides, and wavy shapes on the head. [5] [6] Not all mosaic skin conditions follow Blaschko's lines. [7] The lines are believed to trace the migration of embryonic cells. [8] [9] They do not correspond to nervous, muscular, or lymphatic systems. The lines are not unique to ...
Macular degeneration: Macular degeneration cause loss of central vision, blurred vision (especially while reading), metamorphopsia (seeing straight lines as wavy), and colors appearing faded. [11] Macular degeneration is the third main cause of blindness worldwide, and is the main cause of blindness in industrialised countries. [12]
When viewing an Amsler grid, some straight lines appear wavy and some patches appear blank [67] When viewing a Snellen chart, at least 2 lines decline [citation needed] In dry macular degeneration, which occurs in 85–90 percent of AMD cases, drusen spots can be seen in Fundus photography [citation needed]
Some describe seeing one or more shimmering arcs of white or colored flashing lights. An arc of light may gradually enlarge, become more obvious, and may take the form of a definite zigzag pattern, sometimes called a fortification spectrum (i.e. teichopsia , from Greek τεῖχος, town wall), because of its resemblance to the fortifications ...
Additionally, evaluating the differences between how schizophrenic patients and unaffected individuals see illusions may enable researchers to better identify where specific illusions are processed in the visual streams. [6] An example of the peripheral drift illusion: alternating lines appear to be moving horizontally left or right.
The Vertical-horizontal illusion is the tendency for observers to overestimate the length of a vertical line relative to a horizontal line of the same length. Vista paradox: Visual tilt effects: Wagon-wheel effect: White's illusion: Wundt illusion: The two red vertical lines are both straight, but they may look as if they are bowed inwards to ...
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