- 関
- aphakia
WordNet
- of or relating to or afflicted with aphakia
- someone afflicted by aphakia; someone lacking the natural lenses of the eyes
- absence of the natural lens of the eye (usually resulting from the removal of cataracts)
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2015/11/14 21:20:48」(JST)
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Aphakia |
Classification and external resources |
Specialty |
medical genetics |
ICD-10 |
H27.0, Q12.3 |
ICD-9-CM |
379.31, 743.35 |
OMIM |
610256 |
DiseasesDB |
29608 29607 |
MeSH |
D001035 |
Aphakia is the absence of the lens of the eye, due to surgical removal, a perforating wound or ulcer, or congenital anomaly. It causes a loss of accommodation, far sightedness (hyperopia), and a deep anterior chamber. Complications include detachment of the vitreous or retina, and glaucoma.
Aphakic people are reported to be able to see ultraviolet wavelengths (400–300 nm) that are normally excluded by the lens.[1] They perceive this light as whitish blue or whitish violet. This is probably because all three of the eye's color receptors, the blue more than the others, are stimulated when such a person sees ultraviolet wavelengths.[2] Some animals have a fourth color receptor for ultraviolet wavelengths (see tetrachromacy) and see the near ultraviolet as an extra primary color.
Babies are rarely born with aphakia. Occurrence most often results from surgery to remove congenital cataracts (clouding of the eyes' lens, which can block light from entering the eye and focusing clearly). Congenital cataracts usually develop as a result of infection of the fetus or genetic reasons. It is often difficult to identify the exact cause of these cataracts, especially if only one eye is affected.
People with aphakia have relatively small pupils and their pupils dilate to a lesser degree.[3]
Symptoms and treatment
Without the focusing power of the lens, the eye becomes very farsighted. This can be corrected by wearing glasses, contact lenses, or by implant of an artificial lens. Artificial lenses are described as "pseudophakic." Also, since the lens is responsible for adjusting the focus of vision to different lengths, patients with aphakia have a total loss of accommodation.
References
- ^ Komarnitsky. "Case study of ultraviolet vision after IOL removal for Cataract Surgery".
- ^ David Hambling (May 30, 2002). "Let the light shine in: You don't have to come from another planet to see ultraviolet light". EducationGuardian.co.uk.
- ^ Mary V Gibbens, R Goel, S E Smith (1989). "Effect of cataract extraction on the pupil response to mydriatics" (PDF). British Journal of Ophthalmology 73: 563–565. doi:10.1136/bjo.73.7.563.
External links
- Columbia University's Digital Reference of Ophthalmology
- Aphakia, Cincinnati Children's Hospital Medical Center Ophthalmology Division
- The human is a blocked tetrachromat A review of the spectral sensitivity of the human visual system. (Suggests that the human lens is responsible for blocking the ultraviolet frequencies, that we already have a UV sensor in the retina ready and waiting, and if the UV wasn't blocked, we'd all be tetrachromats.)
Congenital malformations and deformations of eyes (Q10–Q15, 743)
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Adnexa |
Eyelid |
- Ptosis
- Ectropion
- Entropion
- Distichia
- Blepharophimosis
- Ablepharon
- Marcus Gunn phenomenon
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Lacrimal apparatus |
- Congenital lacrimal duct obstruction
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Globe |
Entire eye |
- Anophthalmia (Cystic eyeball, Cryptophthalmos)
- Microphthalmia
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Lens |
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Iris |
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Anterior segment |
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Cornea |
- Keratoglobus
- Megalocornea
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Other |
- Buphthalmos
- Coloboma (Coloboma of optic nerve)
- Hydrophthalmos
- Norrie disease
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Index of the eye
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Description |
- Anatomy
- Physiology
- Phenomena
- appearance
- visual
- optical illusions
- proteins
- Development
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Disease |
- Congenital
- Corneal dystrophy
- Neoplasms and cancer
- Other
- Symptoms and signs
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Treatment |
- Procedures
- Drugs
- infection
- glaucoma and miosis
- mydriatics
- vascular
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UpToDate Contents
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English Journal
- Cornea preservation time study: methods and potential impact on the cornea donor pool in the United States.
- Lass JH1, Szczotka-Flynn LB, Ayala AR, Benetz BA, Gal RL, Aldave AJ, Corrigan MM, Dunn SP, McCall TL, Pramanik S, Rosenwasser GO, Ross KW, Terry MA, Verdier DD; Writing Committee for the Cornea Preservation Time Study Group.
- Cornea.Cornea.2015 Jun;34(6):601-8. doi: 10.1097/ICO.0000000000000417.
- PURPOSE: The aim of this study was to describe the aims, methods, donor and recipient cohort characteristics, and potential impact of the Cornea Preservation Time Study (CPTS).METHODS: The CPTS is a randomized clinical trial conducted at 40 clinical sites (70 surgeons) designed to assess the effect
- PMID 25850706
- Evaluation of Artisan aphakic intraocular lens in cases of pediatric aphakia with insufficient capsular support.
- Gawdat GI1, Taher SG1, Salama MM2, Ali AA1.
- Journal of AAPOS : the official publication of the American Association for Pediatric Ophthalmology and Strabismus / American Association for Pediatric Ophthalmology and Strabismus.J AAPOS.2015 Jun;19(3):242-6. doi: 10.1016/j.jaapos.2015.03.014.
- PURPOSE: To evaluate the visual outcomes and complications after Artisan iris-claw lens implantation in aphakic children with insufficient capsular support.METHODS: In this prospective, interventional noncontrolled study, aphakic eyes of consecutive patients >2 years of age with insufficient caps
- PMID 26059670
- Comparison of Intraoperative Aberrometry, OCT-Based IOL Formula, Haigis-L, and Masket Formulae for IOL Power Calculation after Laser Vision Correction.
- Fram NR1, Masket S2, Wang L3.
- Ophthalmology.Ophthalmology.2015 Jun;122(6):1096-101. doi: 10.1016/j.ophtha.2015.01.027. Epub 2015 Mar 10.
- PURPOSE: To compare the accuracy of intraoperative aberrometry technology and the Fourier-domain optical coherence tomography (OCT)-based intraocular lens (IOL) formula for IOL power calculation in eyes undergoing cataract surgery after previous laser vision correction (LVC) compared with establishe
- PMID 25766733
Japanese Journal
- 無水晶体眼に発症したサイトメガロウイルス網膜症へのガンシクロビル硝子体内注入を施行した1例
- 30年間高含水ソフトコンタクトレンズの連続装用をしている無水晶体眼の1症例
Related Links
- noun Ophthalmology. lack or loss of the lens of the eye. Also, a·pha·cia / əˈfeɪ ʃə, -ʃi ə, -si ə / Show Spelled [uh-fey-sh uh, -shee-uh, -see-uh] Show IPA. Origin: 1860–65; Neo-Latin, equivalent to a-a-6 + Greek phak (ós) lentil (for ...
- APHAKIC is designed to provide support for parents caring for children who have congenital cataracts or have had cataract surgery, PHPV, aphakic glaucoma, IOL’s, and everything else that goes along with aphakia. Adult aphakics ...
Related Pictures
★リンクテーブル★
[★]
無水晶体、無水晶体症、無水晶体眼
- 関
- aphakic
[★]
- 英
- aphakia、aphakic
- 関
- 無水晶体症、無水晶体眼