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遠視

File:Hypermetropia_color.svg · Wikimedia Commons · See Wikimedia Commons

EntityQ177254· pop 71· linked from 373 articles

Also known as hypermetropia, far-sightedness

Far-sightedness, also known as long-sightedness, hypermetropia, and hyperopia, is a condition of the eye where distant objects are seen clearly but near objects appear blurred. This blur is due to incoming light being focused behind, instead of on, the retina due to insufficient accommodation by the lens. Minor hypermetropia in young patients is usually corrected by their accommodation, without any defects in vision. But, due to this accommodative effort for distant vision, people may complain of eye strain during prolonged reading. If the hypermetropia is high, there will be defective vision

AI overview

Hyperopia, commonly called far-sightedness, is a condition where your eyes focus light behind the retina instead of directly on it, making nearby objects appear blurred while distant ones stay clear. It matters because while mild cases may go unnoticed due to your eye's natural focusing ability, severe hyperopia causes blurred vision and eye strain during close-up activities like reading.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Medical condition (new).name
Hyperopia
Medical condition (new).synonyms
Hypermetropia, hyperopia, longsightedness, long-sightedness
Medical condition (new).image
Hypermetropia color.svg
Medical condition (new).caption
Far-sightedness without (top) and with lens correction (bottom)
Medical condition (new).field
Ophthalmology, optometry
Medical condition (new).symptoms
Near blur, Distance and near blur, Asthenopia
Medical condition (new).complications
Accommodative dysfunction, binocular dysfunction, amblyopia, strabismus
Medical condition (new).causes
Axial length of eyeball is too short, lens or cornea is flatter than normal, aphakia
Medical condition (new).risks
Ageing, hereditary
Medical condition (new).diagnosis
Eye exam
Medical condition (new).differential
Amblyopia, retrobulbar optic neuropathy, retinitis pigmentosa sine pigmento
Medical condition (new).treatment
Eyeglasses, contact lenses, refractive surgeries, IOL implantation
Medical condition (new).frequency
~7.5% (US)

via Wikipedia infobox

Research

6,170 papers

via PubMed

Article · 日本語

遠視(えんし、英: Hyperopia)は、目の屈折異常のひとつで、遠方から眼内に入った平行光線が、を働かせていない状態で、網膜の後方に焦点を結ぶ状態をいう。軽度でも遠方視力に問題を生じる近視と違って、遠視は軽度ならば視力に問題を生じないことがある。なぜならば若いうちは目にピントを調節する能力があり、この調節力により表面上覆い隠すことができるからである。この調節力は近くにピントを合わせる方向にしか働かないので、遠視を覆い隠すことはできても近視を覆い隠すことはできない。遠視の弱く調節力の強い場合は遠くにも近くにもピントを合わせることができ、視力に問題を生じない。この場合、本人の自覚や学校で行われる視力検査では遠視であることが分からない。一方、遠視の強い場合、あるいは加齢などによって調節力が衰えた場合は近くが見にくくなる。さらに遠視の強い場合あるいはさらに調節力の衰えた場合は近くも遠くも見にくくなる。

Abstract from DBpedia / Wikipedia · CC BY-SA

Gallery (10)

遠視 · Vinony