| 영문 | hyperopia | 한글 | 원시 |
|---|---|---|---|
| 설명 | 눈에서 들어온 빛은 빛을 느끼는 눈의 부위인 망막에 정확히 촛점이 맞아야지만 사람은 그것을 뚜렷이 볼 수가 있다. 이런 굴절은 주로 각막에 의해서 이루어진다. 각막이란 눈의 검은 동자부위를 덮고 있는 원추형의 구조로 일종의 볼록렌즈로 빛을 모으는 역할을 한다. 그리고 각막에 의해서 꺽여진 빛은 다시 각막의 뒤에 있는 수정체라는 볼록렌즈에 의해서 굴절되는데 이 수정체는 미세하게 촛점을 맞히는 역할을 하는 것으로 그 두께를 자유로이 조절하여 먼 곳을 보거나 가까운 것을 볼 경우에 정확히 촛점을 망막에 맞게 한다. 원시란 수정체의 두께를 조절하지 않은 상태에서 평행광선이 망막 뒤에서 촛점을 맺는 경우를 말한다. 이것의 원인으로는 주로 각막의 굴절력이 약해서 각막을 통과한 빛이 적게 꺽이기 때문일 수도 있고 또는 망막에서 각막까지의 길이가 비정상적으로 짧은 경우도 있을 수가 있다. 그러므로 원시에는 볼록렌즈를 눈앞에 장치하여 굴절력을 증가시켜 주고 있다. |
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| Ht | height of heart; heterozygote; hyperopia, total; hypothalamus |
|---|---|
| Hy | hypermetropia; hyperopia; hypophysis; hypothenar; hysteria |
| facultative hyperopia | Hyperopia that can be compensated by accommodation. Synonym: facultative hyperopia. (05 Mar 2000) |
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| absolute hyperopia | Manifest hyperopia that cannot be overcome by an effort of accommodation. (05 Mar 2000) |
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| axial hyperopia | Hyperopia due to shortening of the anteroposterior diameter of the globe of the eye. (05 Mar 2000) |
| manifest hyperopia | Hyperopia that can be compensated by accommodation. Synonym: facultative hyperopia. (05 Mar 2000) |
| curvature hyperopia | Hyperopia due to decreased refraction of the anterior ocular segment. (05 Mar 2000) |
| hyperopia | Farsightedness or hyperopia occurs when a refractive error in which light rays entering the eye are focused behind the retina. This condition is easily corrected with corrective lenses or contact lenses. (27 Sep 1997) |
| total hyperopia | That which can be determined after complete paralysis of accommodation by means of a cycloplegic. (05 Mar 2000) |
| latent hyperopia | The difference between total and manifest hyperopia. (05 Mar 2000) |
| heterochromatin, facultative | Heterochromatin that need not always be heterochromatic but has the faculty to return to the normal euchromatic state. The inactive x chromosome is made up of facultatative heterochromatin. When a woman transmits that x to a son, it reverts to euchromatin and genetic activity. (12 Dec 1998) |
| facultative | Of parasites, optional. Compare: obligate. (09 Oct 1997) |
| facultative aerobe | <microbiology> An organism which is normally anaerobic but can also grow in the presence or oxygen. (15 Nov 1997) |
| facultative anaerobe | <microbiology> A microorganism which can survive without oxygen (is an anaerobe) but is not harmed if oxygen is present. (09 Oct 1997) |
| facultative heterochromatin | <cell biology> The heterochromatin which is condensed in some cells and not in others, presumably representing stable differences in the activity of genes in different cells. The best known example results from the random inactivation of one of the pair of X chromosomes in the cells of female mammals, (Lyonisation). (18 Nov 1997) |
| facultative parasite | An organism that may either lead an independent existence or live as a parasite, in contrast to obligate parasite. (05 Mar 2000) |
| facultative ponds | Ponds having an aerobic zone on the top and an anaerobic zone on the bottom. (05 Dec 1998) |
| facultative species | <ecology> Species that can occur both in wetlands and uplands, there are three subcategories of facultative species: 1. Facultative wetland plants (FACW) that usually occur in wetlands (estimated probability 67-99%), but occasionally are found in nonwetlands. 2. Facultative plants (FAC) that are equally likely to occur in wetlands or nonwetlands (estimated probability 34-66%). 3. Facultative upland plants (FACU) that usually occur in nonwetlands (estimated probability 67-99%), but occasionally are found in wetlands (estimated probability (1-33%). (09 Oct 1997) |
제품명 |
판매사 |
보험코드 | 성분/함량 | 구분/보험급여 |
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제품명 |
판매사 |
보험코드 | 성분/함량 | 구분/보험급여 |
|---|