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People who wear glasses can be thrown into two broad groups: nearsightedness (myopia) and farsightedness (hyperopia). With both of these conditions the eye doesn't focus on light as it should properly do. In order to fix this, people wear glasses or contacts. The best way to fix your eye problems is to wear contacts, becuase they are closest to your field of vision, they move with your eye, and they don't get in the way of your line of your sight. Contacts stay in place by the tear solution on your eye, it also stays from the pressure of your eyelid.

For people who do wear some type of lense, their strength is measured in diopters. Diopters are a measure of how far the lens bends light. The higher the diopter, the stronger your prescription is. To fix your myopia, you will need to wear concave lenses. Your glasses are going to have a negative diopter, because your eye has too many positive diopters. So they are going to equal each other out. People who need to wear really strong glasses will find that their colors start seperating, which in simpler words the wearer will see color fringes by contrasting colors. This happens because when you look around in eye glasses, your cornea does not stay in the center of the lense, so this does not happen with contact lenses.

For people who have hyperopia, they will wear convex lenses. These are also called magnification lenses. When they wear their glasses, their eyes will seem larger then they actually are. Convex lenses reflect the image so it appears closer for the retina.