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« : 07 EYLL 2013, 13:01:50 »and the sensation of walking uphill is caused by the image projected on the inside back of the eye the virtual image becoming smaller with each prescription. We are all used to the concept of if you stick a magnifying glass, a convex lens, in front of our eyes, we see things, bigger, magnified. But when we stick a concave lens in from of the eye to correct myopia, things get smaller. Someone with Discount football kits big, thick lenses like I used cheap football shirts online to wear, is seeing the world about 30% smaller, and farther away. Try to catch a baseball when it is 30% smaller. Try to judge how far to run to catch it when the world is distorted by 30%. Think you might make the child 8217 s life easier by getting plastic lenses? WRONG! The plastic has a different index of refraction, and the prism effect, where light starts being split into rainbow colors, becomes very pronounced, especially off to the edge of the field of view. I actually had to custom order glasses made from flint glass, instead of the usual crown glass, to fight this chromatic aberration. You may have seen chromatic aberration when you looked through a cheap telescope or cheap pair of binoculars. Try picking out a fast moving baseball from the corner of your eye when it is disassociating cheap authentic football jerseys into its component colors! Selecting frames with small diameter lenses, set close to the eye, can help tremendously with the awful 8220 coke bottle 8221 effects. Contact lenses eliminate these effects entirely, and I highly recommend them if you want the child with bad eyes to participate in sports. I went from never being able to catch a ball as a child, to actually catching a smash line drive foul ball at a minor league baseball game, probably saving the life of the toddler beh
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