Cheap Eyeglasses Blog

There is a saying that eyes are the windows of human’s hearts. It’s very important for you to have your eye examined every year, because many eye problems such as cataracts, glaucoma and retinal problems may offer no telltale symptoms. The purpose of eye exam is to check out people’s vision and eyes health condition, to see if there are any changes or diseases that need eye care or cure.

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I believe that every one should not be unfamiliar with eye test, where the optometrist measures your vision on the letter chart, on which letters get smaller on each line from the top to down. You probably know that with an eye test, the optometrist will ask you to have an eyewear prescription to help you see better if necessary, however, you may probably not know that the optometrist will also assess your eye health, measure the pressure, ensure your eyes are working together efficiently and measure your reading performance at the meantime. Thus undergoing a test regular is important and necessary for anyone.

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Refraction is the basic test of the eye’s focus problems or refractive errors. In general, there are three types of refractive errors: hyperopia, myopia and astigmatism. Hyperopia refers to the condition that the eye is shorter than normal, resulting in a focal point behind the retina which leads to blurry near vision. Myopia is an opposite condition that results from too long eyes. Nearsighted people can not see distant objects clearly. Astigmatic individuals have aspheric corneas which have different curvatures around the eye axis.

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The style of eyeglasses, just like clothing, is of great variety. Therefore, how to choose your own suitable glasses is also a kind of tricky thing. Apart from the fashion and durability, you should pay particular attention to the distance between pupils. And the glasses should match your face shape. Here are some key points concerning how to buy suitable glasses for reference. 
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Danny Perez’s eyes opened wide in surprise as soon as his new glasses were perched on his nose.
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There are three types of eye professionals: optometrists, ophthalmologists and opticians, the former two of which are eye doctors.

An eye optician should only take an optician training program or a formal training. They are only licensed to fit and sell kinds of eyewear according to the prescription from an optometrist or an ophthalmologist.

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Also called side vision, one people’s full horizontal and vertical vision range can be determined by a visual field test, which also detects potential blind spots in the visual field. Some eye and brain disorders are responsible for these visual field defects. Glaucoma, toxic exposure and retina damage can cause optic nerve damage and blind spots. Brain strokes and tumors may also affect the visual field.
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Currently, your visual acuity can be tested using the Snellen eye chart, invented by a Dutch eye doctor in the 1860s. The typical Snellen chart consists of 11 rows of capital letters, which are gradually reduced in size. Unlike prey birds which have acuity of 20/5, only a small human population can achieve 20/10 visual acuity. There is a correspondence between these vision terms and the lines on the chart that you can distinct. If you can see clearly the fourth line of letters from the bottom, your vision acuity is 20/20, with 20/15, 20/10 and 20/5 below that. 20/20 vision has another explanation: the vision most people can achieve at 20 feet. During a vision test, the eye chart is always placed at 20 feet away from you, or is situated behind your chair with the help of a mirror to simulate the 20 feet distance. If you can only read the top one letters, your vision is poorly 20/200. The lowest best-corrected visual acuity to get a driver’s license in US is 20/40. ...

Eye Health Through the Ages

When babies are born, their vision isn’t perfect. Instead, vision develops over time. Infants must learn how to focus on objects, track moving images and use both eyes together. Then, the brain needs to learn how to make meaningful sense of the visual information.
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