Refraction error [[Image:{{{Image}}}|190px|center|]]
| | ICD-10 | H52.0-H52.4 | | ICD-O: | {{{ICDO}}} | | ICD-9 | 367.0-367.2 | | OMIM | {{{OMIM}}} | | MedlinePlus | {{{MedlinePlus}}} | | eMedicine | {{{eMedicineSubj}}}/{{{eMedicineTopic}}} | | DiseasesDB | {{{DiseasesDB}}} | Refraction error is an error in the focusing of light by the eye and a frequent reason for reduced visual acuity. There are two main types: spherical errors and cylindrical errors. These can be corrected by glasses, contact lenses, or refractive surgery. The following codes are used with International Statistical Classification of Diseases and Related Health Problems. ...
The International Classification of Diseases for Oncology (ICD-O) is a domain specific extension of the International Statistical Classification of Diseases and Related Health Problems for tumor diseases. ...
The following is a list of codes for International Statistical Classification of Diseases and Related Health Problems. ...
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The Diseases Database is a free website that provides information about the relationships between medical conditions, symptoms, and medications. ...
Look up focus in Wiktionary, the free dictionary. ...
Prism splitting light Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific context, electromagnetic radiation of any wavelength. ...
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Visual acuity is the eyes ability to detect fine details and is the quantitative measure of the eyes ability to see an in-focus image at a certain distance. ...
For other uses, see sphere (disambiguation). ...
The word cylinder has several meanings. ...
Glasses, spectacles, or eyeglasses are frames bearing lenses worn in front of the human eyes, sometimes for purely aesthetic reasons but normally for vision correction or eye protection. ...
A soft contact lens A contact lens (also known as contact, for short) is a corrective or cosmetic lens placed on the cornea of the eye atop the iris. ...
Refractive eye surgery is any eye surgery used to improve the refractive state of the eye and decrease dependency on glasses or contact lenses. ...
Spherical errors occur when the optical power of the eye is either too large or too small to focus light on the retina. People with refraction error have blurry vision. When the optics are too powerful for the length of the eyeball (this can arise from a cornea with too much curvature or an eyeball that is too long), one has myopia. When the optics are too weak for the length of the eyeball (this can arise from a cornea with not enough curvature or an eyeball that is too short), one has hyperopia. Optical power or dioptric power or refractive power is the degree to which a lens or mirror converges or diverges light. ...
Italic text Human eye cross-sectional view. ...
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber and provides most of an eyes optical power [1]. Together with the lens, the cornea refracts light and consequently helps the eye to focus. ...
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The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber and provides most of an eyes optical power [1]. Together with the lens, the cornea refracts light and consequently helps the eye to focus. ...
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Cylindrical errors occur when the optical power of the eye is too powerful or too weak across one meridian of the optics. It is as if the overall lens tends towards a cylindrical shape along that meridian. People with this refraction error see contours of a particular orientation as blurred, but see contours with orientations at right angles as clear. When one has a cylindrical error, one has astigmatism. Meridian is used in perimetry and in specifying visual fields. ...
Astigmatism is a refraction error of the eye in which there is a difference in degree of refraction in different meridians. ...
Ocular disorders such as keratoconus may induce refractive errors. Keratoconus Keratoconus, or conical cornea (from kerato- cornea and conus cone), is an degenerative disorder of the eye in which the cornea thins and changes shape to become more conical than the normal parabolic. ...
An eye that has a refractive error when viewing a distant object is said to have ametropia or be ametropic. An eye that has no refractive error when viewing a distant object is said to have emmetropia or be emmetropic.
See also
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