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Presbyopia; Other names: The aging eye condition [1] A person with presbyopia cannot easily read the small print of an ingredients list (top), which appear clearer to someone without presbyopia (bottom). Specialty: Optometry, ophthalmology: Symptoms: Difficulty reading small print, having to hold reading material farther away, headaches ...
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. [ 6 ]
Near-sightedness is due to the length of the eyeball being too long; far-sightedness the eyeball too short; astigmatism the cornea being the wrong shape, while presbyopia results from aging of the lens of the eye such that it cannot change shape sufficiently. [3] Some refractive errors occur more often among those whose parents are affected.
The difference between the near-sighted and far-sighted people was noted already by Aristotle. [153] Graeco-Roman physician Galen first used the term "myopia" (from Greek words "myein" meaning "to close or shut" and "ops" (gen. opos) meaning "eye") for near-sightedness. [ 153 ]
A normal eye is considered to have a near point at about 11 cm (4.3 in) for a thirty year old. [1] The near point is highly age dependent (see accommodation). A person with hyperopia or presbyopia would have a near point that is farther than normal.
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Two horse lenses suspended on water by cling wrap with four approximately parallel lasers directed through them. The 1 cm spaced grid indicates a near focus focal length of around 6 cm. Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies.
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