Eyeglasses, also known as glasses or spectacles, are commonly used to correct errors in vision or protect the eyes. They are to be worn over the eyes with support from the ears and nose. Glasses are frames with lenses. They range in shape, size, color and function. Sunglasses and safety glasses or goggles are other popular types of spectacles.
Eyeglasses are often used to correct vision. This is accomplished by altering the focal length of a lens. Focal length can be shifted onto the retina by changing the depth of curve, thickness or shape of a lens. The amount of change necessary is dependent on the amount of error in vision. Spectacles are able to correct refractive errors of the eye that are caused by nearsightedness, farsightedness, astigmatism, presbyopia or myopia. Pinhole spectacles are another type of vision-correcting device. These spectacles are said to correct errors in vision, thought they do not use a lens, refract the light or change the focal length.
Safety goggles are usually constructed using shatter-resistant materials. The plastic lenses of the glasses are important because they can protect the eye from harmful substances and debris. These goggles are built with thick lenses. Individuals who work in factories, laboratories and other industries wear these goggle to avoid eye injuries.
Sunglasses come in many different styles. They may be worn for fashion purposes or to hide the eyes. Generally they are used to reduce blinding light from the sun, especially when driving and improve sight in bright areas. The darkness of the lenses protects the eyes against UV rays and visible light. Some individuals have their eye prescriptions placed in their sunglasses lenses.
Three-dimensional spectacles are mostly used to view 3D movies. The special images produced in these movies create the mirage of multiple dimensions when the glasses are worn. In the past, these 3D lenses had one cyan lens and one red lens. Polarized 3D glasses allow colors to appear three-dimensional.
Individuals may use reading glasses for close-up reading. Those who use these specs typically do not wear eyeglasses on a regular basis. These spectacles contain generic magnifying lenses at varying degrees. They can be purchased as full frames or half eyes. Half eyes have smaller lenses than full frames, which are the standard size of regular glasses. Mild cases of presbyopia and hyperopia, can be treated with the use of reading spectacles.
Multifocal lenses are for individuals who have trouble focusing at different distances. Bifocals have two horizontal viewing areas in each lens. Trifocals have three areas. Many individuals who use multifocal lenses have trouble focusing up close and far away. By adding the correction lenses to a single lens, individuals do not have to worry about switching glasses every time they need to see something. No-line bifocals are preferable because they allow smooth transitions between the many focal areas.
Contacts are lenses that are placed directly on the eye. They are utilized for cosmetic, corrective or therapeutic purposes. Corrective contacts work like prescription eyeglasses. They improve vision. Much like glasses, they refocus light on the retinas. Contact lenses can be used to correct several visual problems.
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