Taking A Closer Look At Prescription Eyeglasses And Contact Lenses

Eyeglasses and contact lenses are used for correcting certain vision problems, particularly those caused by refractive errors. Refractive errors take place when light is unable to focus in the right way on the retina. Devices to correct them are prescribed after an eye examination, performed by either an optometrist or ophthalmologist.

Refractive errors come in different types. Nearsightedness (myopia) causes a person to have a hard time seeing objects placed far from eyes. This is because light is focused just before the retina. On the other hand, farsightedness (hyperopia) causes a person to find it hard to see near objects. In this particular situation, the light is focused behind the retina.

Another type of refractive error is called astigmatism. In here the cornea of the eye is shaped in an irregular fashion. The cornea is a transparent covering found in the front of the eyes. It also does a little focusing, much like the lens part. Presbyopia is another problem. Although it also causes blurring of vision, this is primarily due to aging.

Glasses are the most common forms of eyewear to correct many vision problem types. There’s a frame which sits on the person’s nose and ears, holding the lenses. The frame comes in practically any color, shape and size. Considered as the most durable material used is plastic, and it can come in acrylic, nylon, epoxy, polyamide, etc. It can also accommodate just about any type of prescription lens.

Metal frames are less noticeable than most plastic rivals. However, they’re also generally more expensive. They can come in stainless steel, nickel, titanium, titanium alloy, aluminum, silver, etc. Also there are rimless frames which are less noticeable and lighter in weight than both plastic and metal variants as the nosepiece and temples are attached to the lenses.

When it comes to the lens part, both glass and plastic ones may be used. There are different types available, depending on the vision problem. Concave ones are thin in the center part and are used for correcting nearsightedness. Convex ones are thick in the center, just like a magnifying glass, and are suited for correcting farsightedness. Cylindrical ones curve in one direction and are used for correcting astigmatism. There are also a variety of lens coating options available. Some of them include anti-reflective and UV protection coatings.

Contact lenses are directly placed over the cornea. They also function by correcting vision related to refractive errors, but in an inconspicuous manner. The curvature of one’s eyes will have to be measured first by an optometrist or ophthalmologist. However, if the person’s eyes are too dry or there are some problems with the cornea, contact lenses may be unsuitable.

There are varying types of contact lenses. They are rigid gas-permeable daily wear and extended wear lenses, soft lenses for daily wear and extended wear, disposable lenses and planned replacement soft lenses. While using them has some advantages, it may take some time getting used to wearing them. Also, it may not be able to correct some vision problems as well as eyeglasses, especially severe cases of astigmatism.

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