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.

There are many forms of refractive errors. Myopia or nearsightedness makes you have trouble seeing objects that are far from the eyes, as light focuses in front of your retina. Hyperopia or farsightedness, on the other hand, takes place when light focuses at the back of your retina. Someone with this vision problem finds it hard to see clearly objects that are placed close to the eyes.

Astigmatism is another type of refractive error. This has something to do with the irregular shape of the cornea, which is a transparent structure in front of your eyes. Just like the lens, it also helps in focusing light although in a small part only. Presbyopia also causes blurred vision just like astigmatism. However, this is directly related to aging.

In correcting a variety of vision problems, glasses are the most common choice of many. It consists of a frame which holds the lenses, resting on the nose and ears of the wearer. The frame can come in a variety of shapes, sizes, colors and materials. Plastic is considered as the most durable material for it, and it can accommodate practically all sorts of prescription lenses. It can come in forms such as nylon, epoxy, acrylic and polyamide.

Some prefer metal frames as they\’re less obvious than plastic counterparts, although they\’re usually more expensive. They\’re available in nickel, stainless steel, aluminum, silver, titanium and titanium alloy. Rimless frame types are far lighter and less noticeable that both plastic and metal rivals. In here the nosepiece and temples are directly affixed to the lenses.

Speaking of lenses, they can come in plastic and glass materials. Which one is used depends on several factors, such as which vision problem needs to be corrected. The concave type is suited for someone with nearsightedness. Its center portion is thinner than the sides. The convex type has a thicker center portion and is suited for someone with farsightedness. For a person with astigmatism problem, cylindrical ones are used. Lens coatings are also available, such as anti-reflective and UV, which extends the functionality of the device.

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 many different types of contact lenses currently available. They include rigid lenses, soft lenses for daily wear, soft lenses for extended wear, disposable, and planned-replacement ones. Although using them provides different benefits, the person needs time to get used to wearing them. There are also instances wherein the problem, such as severe astigmatism, isn\’t corrected as well just like when wearing eyeglasses.

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