Corrective lenses
Corrective Lenses
Corrective lenses are pieces of glass or plastic, usually mounted in a frame, that are worn in front of the eyes to correct vision. They are used to correct refractive errors by modifying the focus of light entering the eye in order to alleviate the effects of conditions such as nearsightedness (myopia), farsightedness (hypermetropia), or astigmatism.
Pronunciation
Cor·rec·tive lenses /kəˈrektiv ˈlenziz/
Etymology
The term "corrective lenses" comes from the Latin "correctus", past participle of "corrigere", meaning "to correct", and the Latin "lens", meaning "lentil", due to the lentil-like shape of a lens.
Types of Corrective Lenses
There are several types of corrective lenses, including:
- Eyeglasses: These are the most common type of corrective lenses. They consist of a pair of lenses mounted in a frame that sits on the bridge of the nose and hooks over the ears.
- Contact lenses: These are thin lenses that are placed directly on the surface of the eye. They provide a more natural field of view than eyeglasses and do not collect moisture from rain, sweat, or condensation.
- Intraocular lenses: These are implanted inside the eye, usually replacing the eye's natural lens during cataract surgery.
Related Terms
- Refractive error: A problem with the eye's ability to properly focus light, causing blurred vision.
- Myopia: Also known as nearsightedness, a condition where distant objects appear blurred while close objects can be seen clearly.
- Hypermetropia: Also known as farsightedness, a condition where close objects appear blurred while distant objects can be seen clearly.
- Astigmatism: A condition where the eye does not focus light evenly onto the retina, causing blurred or distorted vision at all distances.
- Presbyopia: A condition associated with aging, where the eye exhibits a progressively diminished ability to focus on near objects.
External links
- Medical encyclopedia article on Corrective lenses
- Wikipedia's article - Corrective lenses
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