Eyeglasses are frames bearing lenses worn in front of the eyes, usually for the purpose of vision correction or ultraviolet (UV) ray protection. Glasses are generally supported by pads on the bridge of the nose and by arms placed over the ears.
Types of Glasses:
Modern eyeglass lenses are usually made from plastic such as polycarbonate and CR-
There are also many fashionable styles of frames available today, reducing the self-
Corrective lenses are used to treat refractive errors of the eye, such as farsightedness or nearsightedness, by modifying the effective focal length of the lens in order to alleviate the effects of these vision impairments. Correcting vision is accomplished by using lenses to move the focal point on the retina to each patient’s particular needs. The depth of the curve, the thickness of the frames, and the precise shape of the lens can all be used to change the focal point. These adjustments will be able to correct astigmatisms and presbyopia, as well as far and nearsightedness.
Sunglasses are made with darkened lenses to provide the eyes with protection against bright visible light, as well as UV light. Sunglasses can be made with either prescription or non-
Bifocals, Trifocals, and Progressive Lenses:
As people age and their ability to focus worsens, they may decide to use multiple-
Whereas contact lenses present risks such as infection, glasses are a completely risk-
Glasses are easy to maintain, needing only to be updated when the prescription changes. Contacts, on the other hand, require strict cleaning procedures, and must be replaced often.
Some patients, especially adolescents, may feel self-
A main disadvantage associated with glasses is that they hinder the patient’s ability to engage in certain sports or activities. However, advancements have made so that corrective lenses can be added to work masks or sports goggles to aid vision with minimal interference to activity.