Index myopia is attributed to variation in the index of refraction of one or more of the ocular media. [65] As with any optical system experiencing a defocus aberration, the effect can be exaggerated or masked by changing the aperture size. In the case of the eye, a large pupil emphasizes refractive error and a small pupil masks it.

退化性近視（Degenerative Myopia）：又稱惡性近視(Malignant Myopia) 或病理性近視(Pathologic Myopia)，特徵是眼底明顯變化，例如後葡萄腫（posterior staphyloma），而且與矯正後的高屈光誤差和超常視覺敏銳度有關 [25] 。這種類型的近視會隨著時間惡化。

2022年5月22日 · Index myopia :- Index Myopia occurs from increase in the refractive index of crystalline lens associated with nuclear sclerosis. It happens in old age (associated with cataract),when the refractive index of lens increases,resulting in increased power of lens, so that light rays meet infront of fovea.

Index myopia is attributed to variation in the index of refraction of one or more of the ocular media. Various forms of myopia have been described by their clinical appearance: [3]

2021年7月19日 · Near-sightedness also known as short sightedness and Myopia is a refractive error or eye disorder where light rays focus in front of, instead of on the retina. Myopia is the most common type eye disorder and is estimated to affect 1.5 billion people.

Index myopia is attributed to variation in the index of refraction of one or more of the ocular media. Cataracts may lead to index myopia. Form deprivation myopia occurs when the eyesight is deprived by limited illumination and vision range, or the eye is modified with artificial lenses or deprived of clear form vision.

Myopia: “A refractive error in which rays of light entering the eye parallel to the optic axis are brought to a focus in front of the retina when ocular accommodation is relaxed. This usually results from the eyeball being too long from front to back, but can be caused by an overly curved cornea, a lens with increased optical power, or both.

The aim of this paper is to propose a set of definitions for myopia that are evidence based, statistically sound and clinically relevant. The authors undertook a critical review of current terminology and choice of myopia thresholds

As a quantitative trait, we recommend that myopia be divided into myopia (i.e., all myopia), low myopia, and high myopia. The current consensus threshold value for myopia is a spherical equivalent refractive error 0.50 diopters (D), but this carries significant risks of classification bias.

Myopia is one type of refractive error where the parallel rays of light are brought into focus in front of the retina when accommodation is at rest. This is also called short sightedness or nearsightedness. Nearsightedness is an error of visual focusing that …