Corrective lens
Corrective lens
A Corrective lens is a lens typically worn in front of the eye to improve vision. The most common use is to treat refractive errors such as myopia, hypermetropia, astigmatism, and presbyopia. Corrective lenses are also used in various forms of telescope to correct spherical aberration.
Pronunciation
/kəˈrɛktɪv lɛnz/
Etymology
The term "corrective lens" is derived from the Latin "correctivus", meaning "tending to correct", and "lens", from the Latin "lentis", meaning "lentil", due to the similarity in shape.
Types of Corrective Lenses
Corrective lenses come in various types, including:
- Single vision lenses: These have the same focal power throughout the entire lens and can be used to correct nearsightedness, farsightedness, or astigmatism.
- Bifocal lenses: These have two different focal powers in the same lens.
- Trifocal lenses: These have three different focal powers in the same lens.
- Progressive lenses: These have a gradient of focal powers in the lens, providing a smooth transition from distance correction on top to near vision correction at the bottom.
Related Terms
External links
- Medical encyclopedia article on Corrective lens
- Wikipedia's article - Corrective lens
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