Important Information To Know About Eyeglasses

Eyeglasses are frames with lenses. They are worn over the eyes and supported by the ears and nose. Their purpose is to correct vision and protect the eyes. They can also be worn as a fashion accessory. Common forms of glasses are prescription eyeglasses, safety glasses, sunglasses and contact lenses.

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 can be used to hide the eyes, improve vision while in the direct sunlight and decrease glare. They may even be used just for aesthetic purposes. These glasses can have prescription lenses added to them. Dark lenses are designed to protect the eyes against ultraviolet and visible light. Sunglasses can come in a variety of shapes, sizes and colors.

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 struggling to see when items are close may use reading spectacles. As their name suggests, these spectacles are usually worn while reading up-close text. They contain magnifying lenses. The magnification levels cover a large spectrum; therefore most reading specs do not require a prescription. They can be purchased at almost any store. Full frames and half-eyes are the two types of reading glasses. Full frames are usually the size of traditional lenses. Half-eyes have lenses that are half the size of traditional lenses. Reading spectacles have been proven to treat some instances of hyperopia and presbyopia.

Bifocals contain two focal areas in one lens. Trifocals contain three focal areas in one lens. Each focal area runs horizontally across the lens. Individuals who have trouble focusing at more than one distance use multifocal lenses in their eyeglasses. Progressive lenses, also known as no-line bifocals, create a smooth transition between the two or three focal areas.

Contacts are lenses go directly on the eye. They can be for corrective, therapeutic or cosmetic purposes. Corrective contacts act in the same ways as prescription eyeglasses. They are used to improve vision, by focusing light on the retinas. Generally these lenses are used to correct short or nearsightedness, far or longsightedness, astigmatism and presbyopia.

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