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Axial: Axial hypermetropia occur when the axial length of eyeball is too short. About 1 mm decrease in axial length cause 3 diopters of hypermetropia. [2] One condition that cause axial hypermetropia is nanophthalmos. [12] Curvatural: Curvatural hypermetropia occur when curvature of lens or cornea is flatter than normal.
The following other wikis use this file: Usage on ast.wikipedia.org Hipermetropía; Usage on az.wikipedia.org Hipermetropiya; Usage on bg.wikipedia.org
In 1632, Vopiscus Fortunatus Plempius examined a myopic eye and confirmed that myopia was due to a lengthening of its axial diameter. [ 157 ] The idea that myopia was caused by the eye strain involved in reading or doing other work close to the eyes was a consistent theme for several centuries. [ 101 ]
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Knapp's Rule states that lenses placed at the anterior focal point of the eye, generally 15 mm in front of the eye, will create similarly sized images on the retina, whenever the disparity between the two eyes is due to a difference in axial length of the eyes.
Anisometropia is caused by common refractive errors, such as astigmatism, far-sightedness, and myopia, in one eye. [6]Anisometropia is likely the result of both genetic and environmental influences.
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