منابع مشابه
Reversal of vision metamorphopsia: clinical and anatomical characteristics.
BACKGROUND Metamorphopsia is a visual illusion that distorts the size, shape, or inclination of objects. Reversal of vision metamorphopsia (RVM) is a rare transient form of metamorphopsia described as an upside-down, 180 degrees rotation of the visual field in the coronal plane. The pathophysiological characteristics of RVM remain unclear. DESIGN Patients with RVM had a complete neurologic ex...
متن کاملMetamorphopsia and letter recognition.
Acuity is the most commonly used measure of visual function, and reductions in acuity are associated with most eye diseases. Metamorphopsia--a perceived distortion of visual space--is another common symptom of visual impairment and is currently assessed qualitatively using Amsler (1953) charts. In order to quantify the impact of metamorphopsia on acuity, we measured the effect of physical spati...
متن کاملMetamorphopsia: An Overlooked Visual Symptom.
Metamorphopsia is a common symptom in different macular disorders. Micropsia and macropsia are special types of metamorphopsia. Recent theories suggest that both retinal and cortical mechanisms are involved in the development and changes of metamorphopsia. Different functional tests have been proposed for the evaluation of metamorphopsia: from the Amsler grid to the hand-held mobile devices for...
متن کاملMotion-reversal Reveals Two Motion Mechanisms Functioning in Scotopic Vision
We studied scotopic motion mechanisms, using a two-frame sinusoidal grating separated by various ISIs equated for mean luminance level. Perceived direction of displacement varied with both ISI and luminance. As luminance decreased, apparent motion reversal disappeared. This is predicted by a first-order motion model if the underlying temporal impulse response function varies from biphasic under...
متن کاملQuantification of metamorphopsia in patients with epiretinal membranes.
PURPOSE To quantify the degree of metamorphopsia in patients with idiopathic epiretinal membranes (ERMs), by use of a new metamorphopsia chart (M-CHARTS) developed by the authors. METHODS These M-CHARTS had 19 dotted lines with dot intervals of between 0.2 degrees (fine) and 2.0 degrees (coarse) visual angles. As the dot intervals were changed from fine to coarse, a decrease in the severity o...
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ژورنال
عنوان ژورنال: Archives of Neurology
سال: 1998
ISSN: 0003-9942
DOI: 10.1001/archneur.55.10.1362