单词	hypermetropia
释义	hypermetropia(hyperopia) Long-sightedness. A vision defect in which the lens of the eye is unable to accommodate sufficiently to throw the image of near objects onto the retina. It is caused usually by shortness of the eyeball rather than any fault in the lens system. The subject requires spectacles with converging lenses to bring the image from behind the retina back on to its surface. See illustration. Hypermetropia
随便看	gun metal GUT GWS model gyrocompass gyromagnetic ratio gyroscope habit hadron Hahn, Otto half cell half-life half-thickness half-wave plate half-wave rectifier half-width Hall effect Halley's comet Halley, Edmund halo Hamiltonian hard ferromagnetic materials hard radiation hardware harmonic harmonic motion

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