Eyeglasses

Eyeglasses are devices consisting of hard plastic or glass lenses mounted in a frame that holds them in front of a person's eyes, typically using a bridge over the nose and arms which rest over the ears. Eyeglasses are typically used for vision correction, such as with reading glasses and glasses used for nearsightedness.

History[edit | edit source]

The concept of eyeglasses was first introduced in Italy, around 1290. Initially, they were only used for reading, but with the passage of time, they started being used for seeing things at a distance as well.

Types of Eyeglasses[edit | edit source]

There are several types of eyeglasses available, each serving a different purpose.

Single Vision Eyeglasses: These are the most common type of eyeglasses, which can correct for nearsightedness, farsightedness, or astigmatism.

Bifocal Eyeglasses: These eyeglasses have two different optical powers. They are most commonly prescribed to people with presbyopia who also require a correction for myopia, hypermetropia, and/or astigmatism.

Trifocal Eyeglasses: These eyeglasses have three different optical powers. They are used to correct distance, intermediate, and near vision.

Progressive Eyeglasses: These eyeglasses have a gradient of increasing lens power, added to the wearer's correction for the other refractive errors.

Materials[edit | edit source]

Eyeglasses frames can be made from a variety of materials. The most common materials include metal and plastic.

References[edit | edit source]

Eyeglasses Resources
Need Help Finding a Doctor? Need help finding a doctor or specialist anywhere in the world? Explore our world directory. WikiMD's DocFinder can assist you in locating millions of physicians.	Medical Knowledge Access the latest research - Most recent articles Ongoing trials.