Definitions for presbyopia
ˌprɛz biˈoʊ pi ə, ˌprɛs-pres·by·opi·a

Princeton's WordNetRate this definition:0.0 / 0 votes

1. presbyopia, farsightednessnoun

   a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45

WiktionaryRate this definition:0.0 / 0 votes

1. presbyopianoun

   Inability of the eye, due to ageing, to focus on nearby objects; farsightedness

WikipediaRate this definition:0.0 / 0 votes

1. Presbyopia

   Presbyopia is physiological insufficiency of accommodation associated with the aging of the eye that results in progressively worsening ability to focus clearly on close objects. Also known as age-related farsightedness (or age-related long sight in the UK), it affects many adults over the age of 40. A common sign of presbyopia is difficulty reading small print which results in having to hold reading material farther away. Other symptoms associated can be headaches and eyestrain. Different people will have different degrees of problems. Other types of refractive errors may exist at the same time as presbyopia. This condition is similar to hypermetropia or far-sightedness which starts in childhood and exhibits similar symptoms of blur in the vision for close objects. Presbyopia is a typical part of the aging process. It occurs due to age related changes in the lens (decreased elasticity and increased hardness) and ciliary muscle (decreased strength and ability to move the lens), causing the eye to focus right behind rather than on the retina when looking at close objects. It is a type of refractive error along with nearsightedness, farsightedness, and astigmatism. Diagnosis is by an eye examination.Presbyopia can be corrected using glasses, contact lenses, multifocal intraocular lenses, or LASIK (presbyLASIK) surgery. The most common treatment is glass correction using appropriate convex lens. Glasses used to correct presbyopia may be simple reading glasses, bifocals, trifocals, or progressive lens.People over 40 are at risk for developing presbyopia and all people become affected to some degree. Around 25% of people (1.8 billion globally) are currently affected.

ChatGPTRate this definition:0.0 / 0 votes

1. presbyopia

   Presbyopia is a common age-related vision condition where the eye's natural lens hardens and loses its flexibility, resulting in difficulty focusing on close objects. This usually occurs around middle age and is often corrected with reading glasses or contact lenses.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Presbyopia

   a defect of vision consequent upon advancing age. It is due to rigidity of the crystalline lens, which produces difficulty of accommodation and recession of the near point of vision, so that objects very near the eyes can not be seen distinctly without the use of convex glasses. Called also presbytia

2. Etymology: [NL., from Gr. old, n., an old man + , , the eye.]

WikidataRate this definition:0.0 / 0 votes

1. Presbyopia

   Presbyopia is a condition where with age, the eye exhibits a progressively diminished ability to focus on near objects. Presbyopia’s exact mechanisms are not known with certainty; the research evidence most strongly supports a loss of elasticity of the crystalline lens, although changes in the lens’s curvature from continual growth and loss of power of the ciliary muscles have also been postulated as its cause. Like gray hair and wrinkles, presbyopia is a symptom caused by the natural course of aging. The first signs of presbyopia – eyestrain, difficulty seeing in dim light, problems focusing on small objects and/or fine print – are usually first noticed between the ages of 40 and 50. The ability to focus on near objects declines throughout life, from an accommodation of about 20 dioptres in a child, to 10 dioptres at age 25, and levels off at 0.5 to 1 dioptre at age 60. The expected, maximum, and minimum amplitudes of accommodation for a corrected patient of a given age can be determined using Hofstetter's formulas: Expected amplitude = 18.5 - 0.3 x, Maximum amplitude = 25 - 0.4 x, Minimum amplitude = 15 - 0.25 x.

Chambers 20th Century DictionaryRate this definition:0.0 / 0 votes

1. Presbyopia

   pres-bi-ō′pi-a, n. long-sightedness, together with diminished power of distinguishing things near, common in old age—also Pres′byopy.—n. Pres′byope, one so affected.—adj. Presbyop′ic.—n. Pres′byte, one affected with presbyopia. [Gr. presbys, old, ōps, ōpos, the eye.]

The Nuttall EncyclopediaRate this definition:0.0 / 0 votes

1. Presbyopia

   diminution of sight due to age, occurring usually about forty-five, when near objects are less distinctly seen than distant, an affliction due to the flattening of the lens.

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Presbyopia

   The normal decreasing elasticity of the crystalline lens that leads to loss of accommodation.

How to pronounce presbyopia?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

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   Fred

   US English

   Tessa

   South African

How to say presbyopia in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of presbyopia in Chaldean Numerology is: 2

2. Pythagorean Numerology

   The numerical value of presbyopia in Pythagorean Numerology is: 9

Popularity rank by frequency of use

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=presbyopia
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Presbyopia
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Presbyopia
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/presbyopia
6. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=presbyopia
7. ^ Chambers 20th Century Dictionary
   https://www.gutenberg.org/files/37683/37683-h/37683-h.htm#:~:text=presbyopia
8. ^ The Nuttall Encyclopedia
   https://www.gutenberg.org/cache/epub/12342/pg12342-images.html#Presbyopia