The normal condition of the EYE as regards refraction of light rays. When the muscles in the eyeball are completely relaxed, the focusing power is accurately adjusted for parallel rays, so that vision is perfect for distant objects.
n. the state of refraction of the normal eye, in which parallel light rays are brought to a focus on the retina with the accommodation relaxed. Distant objects are seen clearly without any effort to focus. Compare ametropia; hypermetropia; myopia.
(long-sightedness) n. the condition in which parallel light rays are brought to a focus behind the retina when the *accommodation is relaxed (see illustration). Moderate degrees of hypermetropia may not cause blurred vision in children and young adults because of their ability to accommodate, but for older people and those with greater degrees of hypermetropia near vision is more blurred than distance vision. Normal vision can be restored by wearing spectacles with convex lenses. Compare emmetropia; myopia.... hypermetropia
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