hypermetropia


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Related to hypermetropia: regular astigmatism

hypermetropia

[‚hī·pər·mə′trō·pē·ə]
(medicine)
A defect of vision resulting from too short an eyeball so that unaccommodated rays focus behind the retina. Also known as farsightedness; hyperopia.
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The effect of uncorrected hypermetropia is more difficult to predict and the practitioner should not assume normal distance visual acuity.
These have been demonstrated in children with Down's syndrome (5) and cerebral palsy (6) when distance refractive errors are fully corrected, and in children with Down's syndrome the accommodative lag is unaffected by single vision spectacles for hypermetropia.
35) In particular, it is a cycloplegic agent that can at least detect latent hypermetropia, for example in school children, teenagers and those in their early 20s, with otherwise normal refractive status and/or with moderate hypermetropia, (36) as well as for children during the post-natal period.
Family history of strabismus, high hypermetropia and amblyopia
44-45) Dry autorefraction seems particularly inaccurate in hypermetropia (46) and astigmatism in children of preverbal age, (47) although hand-held autorefraction devices can evaluate astigmatism without administration of cycloplegic drugs, with the same repeatability as wet retinoscopy.
In this context, emmetropia can be taken to mean a very small range of refractive errors around low hypermetropia.
Simple eye growth would reduce hypermetropia but increase myopia, so it is clear that emmetropisation is an active process involving feedback about the refractive status.
There is a strong association between childhood hypermetropia and strabismus.