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astigmatism - Definition:
(Source: MedicineNet)
Astigmatism: A common form of visual impairment in which part of an image is blurred, due to an irregularity in the curvature of the front surface of the eye, the cornea. The curve of the cornea is shaped more like an American football or a rugby ball rather than a normal spherical basketball. Light rays entering the eye there are not uniformly focused on the retina. Rays entering through the more-curved surface are focused before the rays coming through the less-curved surface. The light is foc
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About astigmatism
(Source:
eMedicineHealth)
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In order to see clearly, the eye must be able to focus light into a single plane onto the back of the eye at the retina. The word astigmatism comes from the Greek "a" meaning "without" and "stigma" meaning "spot." In astigmatism, a point (or spot) of light is focused at two different planes, causing blurred vision. An optical system (or eye) without astigmatism has only one focus for all rays of light. An optical system with astigmatism is one where rays that propagate in two perpendicular plane
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Causes of astigmatism
(Source: MedLinePlus)
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Causes People are able to see because the front part of the eye is able to bend (refract) light and point it to the back surface of the eye, called the retina. Changes in the length of the eye, or the shape of either the lens or the cornea make it more difficult for the eyes to focus light. If the light rays are not clearly focused on the retina, the images you see may be blurry. With astigmatism, the cornea (the clear tissue covering the front of the eye) is abnormally curved, causing vision t
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astigmatism - Conventional Treatments
(Source: MedLinePlus)
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Treatment Mild astigmatism may not need to be corrected. Glasses or contact lenses will correct astigmatism. Laser surgery can help change the shape of the cornea surface to correct astigmatism, along with nearsightedness or farsightedness.
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Further Reading on astigmatism
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Presbyopia - Topic Overview (
WebMD
)
What is presbyopia ? Presbyopia is the normal worsening of vision with age , especially near vision . As you approach middle age , the ...to correct nearsightedness, farsightedness, or astigmatism , you'll...
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Should I have cataract surgery? (
WebMD
)
Consider the following when making your decision : Not all cataracts need to be removed . Your decision on whether to have surgery ...such as nearsightedness, farsightedness, or astigmatism . But the...
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An Overview of Refractive and Laser Eye Surgery (
WebMD
)
Information on various types of refractive and laser eye surgery to correct vision problems...is used to correct vision in people who are nearsighted, farsighted, and/or have astigmatism . During LASIK...
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Thermal Keratoplasty for Farsightedness - Topic Overview (
WebMD
)
Thermal keratoplasty is a type of refractive surgery that uses heat to change the shape of the cornea by shrinking the collagen ...an initial overcorrection, inability to treat astigmatism , and a...
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Contact lenses (
WebMD
)
...plastic discs shaped to correct an eyesight problem such as nearsightedness, farsightedness, or astigmatism . These are called...as nearsightedness, farsightedness, presbyopia, or astigmatism . These...
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LASIK (Laser In-Situ Keratomileusis) for Nearsightedness (
WebMD
)
...is a relatively new type of laser surgery for correcting nearsightedness (myopia) and astigmatism ...the most common laser surgery for correcting nearsightedness (myopia) and astigmatism . LASIK makes...
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PRK,LASEK,and Epi-LASIK for Nearsightedness (
WebMD
)
Photorefractive keratectomy ( PRK ) uses a laser to reshape the cornea by removing a small portion of ...the healing process. PRK may be used to correct nearsightedness and astigmatism at the same time.
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Radial Keratotomy (RK) for Nearsightedness (
WebMD
)
Radial keratotomy ( RK ) involves making tiny cuts in the cornea , which flatten it and reduce ...cornea , which flatten it and reduce nearsightedness. In people who have both astigmatism and...
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Cataracts - Cataract surgery (
WebMD
)
The lens of the eye is enclosed in a lining called the lens capsule . Extracapsular surgery , also called extracapsular cataract ...after surgery. Retinal detachment. Glaucoma. Astigmatism or strabismus.
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