Ametropia (from other Greek ἄμετρος “disproportionate” + ὄψ , born ὀπός “eye”) is a change in the refractive power of the human eye , the consequence of which is that the back focus of the eye does not fall on the retina when the accommodating muscle is relaxed.
| Ametropia | |
|---|---|
| ICD-10 | H 52.0 - H 52.4 |
| ICD-10-KM | |
| ICD-9 | 367.0 - 367.2 - 367.9 |
| Diseasesdb | 29645 |
| Mesh | |
Content
Description
If a parallel beam of light from distant objects is focused in front of the retina , then such an eye is called myopic , or myopic .
If the rays from distant objects converge behind the retina, then they speak of farsightedness , or hyperopia.
Astigmatism is also attributed to ametropia, due to the difference in the refractive power of the sections of the lens and / or cornea of the eye.
If there is a significant difference (more than 3 D ) in eye refraction ( anisometropia ), then binocular vision is made almost impossible.
Treatment
To eliminate ametropia, glasses and contact lenses are used . With myopia - with negative, with hyperopia - with positive lenses . To compensate for astigmatism, cylindrical lenses are made.
See also
- Emmetropia
Notes
- Ametropia // Photokinotechnics: Encyclopedia / Ch. ed. E.A. Iophis . - M .: Soviet Encyclopedia , 1981.- 447 p.
Links
- Ametropia // Brockhaus and Efron Encyclopedic Dictionary : in 86 volumes (82 volumes and 4 additional). - SPb. , 1890-1907.