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An afterimage, or after-image, is an image that continues to appear in the eyes after a period of exposure to the original image. An afterimage may be a normal phenomenon (physiological afterimage) or may be pathological ( palinopsia ).
Itchy eyes can be harmless and caused by allergies or eye strain, but they could also be the result of a viral infection. Experts explain how to get relief.
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A number of computer and smartphone applications adjust the computer video color temperature, reducing the amount of blue light emitted by the screen, particularly at night. Dry eye is a symptom that is targeted in the therapy of CVS. The use of over-the-counter artificial-tear solutions can reduce the effects of dry eye in CVS.
[Click on image to enlarge] A similar 'sensory fading,' or filling-in, can be seen of a fixated stimulus when its retinal image is made stationary on the retina (a stabilized retinal image). Stabilization can be done in at least three ways. First, one can mount a tiny projector on a contact lens. The projector shines an image into the eye.
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From world-famous walkways to rainbow-colored neighborhoods, we're rounding up 40 of the most beautiful streets in the world to add to your travel bucket list.
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