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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.
Visual snow is a phenomenon where a person perceives visual disturbances, such as fine graininess or "static," in their field of vision. This can occur in low-light conditions, in the dark, or when the visual system amplifies light perception.
According to standards in the eye professions, the left side of the horizontal meridian, as seen by the subject, has 0-deg orientation, and orientations increase in a clockwise direction, again as seen by subject. Cardinal directions are horizontal and vertical. The horizontal effect is an extension of the oblique effect in which...
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 ...
The line from point O outward through object point B specifies the optical direction, d B, of the object's base from the eye, let's say toward the horizon. The line from point O through point A specifies that endpoint's optical direction, d A, toward some specific elevation value (say, 18 degrees
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A test image for the anti-McCollough effect. On first looking at this image, the vertical and horizontal lines should look black and white, colorless. After induction, the space between vertical lines should look green and the space between horizontal lines should look red.
Micropsia is a condition affecting human visual perception in which objects are perceived to be smaller than they actually are. Micropsia can be caused by optical factors (such as wearing glasses), by distortion of images in the eye (such as optically, via swelling of the cornea or from changes in the shape of the retina such as from retinal edema, macular degeneration, or central serous ...
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