Eyeglasses are frames containing lenses that are placed in front of eyes to correct vision or provide protection. Safety glasses offer protection against flying objects, light, or radiation. Sunglasses improve vision in bright light and can minimize ultraviolet light damage. Other glasses can help with the viewing of visual information or be worn for aesthetic reasons.
Glasses come with padded supports to rest on the nose bridge and have sides to rest on the ears. The most popular lenses are the CR-39 type. These block infrared and ultraviolet radiation, have low dispersion, are scratch resistant, and weigh little.
There are many types of eyeglasses. These include corrective, safety, sun, 3D, reading, bifocal, trifocal, progressive, and extreme magnification glasses. Corrective glasses use lenses to modify the lenses focal length to improve nearsightedness, farsightedness, and astigmatism.
Nearsightedness makes objects far away appear blurry and those close up seem clear. To improve this, glasses lenses worn are concave in shape. Farsightedness is treated with convex shaped lenses and make objects close up less blurry. Cylindrical lenses fix sight issues from astigmatism, a disorder altering the path of light to the retina. All of these corrective eyeglasses successfully improve the sight of people with these problems. They also reduce the side effects they experience as a consequence of their conditions, such as headaches from squinting.
Safety glasses are made of a plastic lens that is resistant to shattering. In this way they prevent damage to eyes from any flying debris. There is great variability in the level of protection provided by products. Ones worn in medical fields are designed to shield against blood splatter. Those worn in factories must protect against sawdust, metal, or flying wood. Factory glasses will have a stronger lens with further shielding than the medical ones. Lenses in either can be shaped so they are also corrective.
Sunglasses can be prescription or not and use lenses that are darkened. This darkening gives protection against light, including UV rays. Photochromatic lenses may be used as well, which darken only in the presence of UV light. Light polarization is also possible, which helps to eliminate glare. This would be especially beneficial for pilots, who might otherwise be blinded during flight.
Yellow shaded lenses increase color contrast and improve depth perception. This is a great advantage at dusk but can be harmful if worn at night. Sometimes these are not worn for their functional uses but because they are considered aesthetically pleasing. Individuals who are blind may also wear sunglasses to hide their eyes.
3D glasses trick the eyes into seeing in three dimensions when looking at only two. This is achieved by using a blue lens and a red one. Another option is to have one that is polarized vertically and another that is polarized horizontally. The trick is to have one eye take in different information from the other.
Eyeglasses come in various sizes, shapes, and uses. They can be worn to correct sight and protect, or simply as a statement of fashion. Even 3D versions exist and are used to see in three dimensions for entertainment purposes.
There are many different types of eyeglasses available to satisfy your every need. The premier online retailer offers eyeglass frames for men, as well as a variety of eyeglass frames for women. Look your sharpest with these high-quality lenses.
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