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How Do Prescription Glasses Work?
Historians agree that the first recorded use of a corrective lens was by the Roman emperor Nero in the first century. Nero used to watch gladiatorial games using an emerald to enhance his vision. Since that time, prescription glasses made quite a huge leap forward and are now used widely as day-to-day glasses, reading glasses and prescription sunglasses. If you require corrective vision aids to improve your vision impairment, it is important to understand how glasses work.
Prescription glasses tend to resolve two vision impairment problems, nearsightedness (also known as Myopia) and farsightedness (also know as Hyperopia).
Nearsightedness is a common condition where an eyesight abnormality results in the eye's faulty refractive ability and distant objects appear blurred. The second common condition is farsightedness where vision for distant objects is better than for near objects. So, how do prescription glasses resolve the two common conditions?
For nearsightedness correction, glasses correct the problem by offering a concave lens that bends light rays outward, which normalises the eyeball. In farsightedness correction, glasses use a convex lens that bends the light inward before it reaches the eye's lens, thereby correcting vision.
If you suspect you might suffer from any eyesight condition the first step is to get your eyes tested by your local optician. At the end of it, the optician must - by law - provide you with a copy of your prescription and you then can decide if you would like to purchase your glasses from the optician or compare prices with other high street or online opticians.
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