Ametropia
Ametropia
Ametropia (pronounced: /ˌæmɪˈtroʊpiə/) is a condition of the eye where the refractive index is not matched to the eye's length, causing a refractive error. This results in a blurred vision as light is not focused correctly onto the retina.
Etymology
The term "Ametropia" is derived from the Greek words "a" meaning "not", "metron" meaning "measure", and "ops" meaning "eye". Thus, it translates to "not measured eye", referring to the mismatch in the eye's refractive index.
Types of Ametropia
There are three main types of ametropia:
- Myopia (nearsightedness): This is a condition where the eye is too long in relation to the refractive power, causing light to focus in front of the retina. This results in blurred distance vision.
- Hypermetropia (farsightedness): This is a condition where the eye is too short in relation to the refractive power, causing light to focus behind the retina. This results in blurred near vision.
- Astigmatism: This is a condition where the cornea or lens has an irregular shape, causing light to focus unevenly onto the retina. This results in blurred vision at all distances.
Treatment
Treatment for ametropia typically involves the use of corrective lenses such as glasses or contact lenses. In some cases, refractive surgery such as LASIK or PRK may be recommended.
Related Terms
External links
- Medical encyclopedia article on Ametropia
- Wikipedia's article - Ametropia
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