| astigmatism |
is an optical aberration that spreads the image out into an ellipse or line. It can be caused by poorly made or mounted optics that distort the mirror or lens.
출처: www.telescopehouse.co.uk/page.aspx
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| astigmatism |
is always present if the corneal surface is different from the ideal ball-shape curvature. Further Information
출처: www.vsdar.de/english/lexikon/a.html
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| astigmatism |
a lens aberration that elongates images which change from a horizontal to a vertical position on opposite sides of best focus. It is generally associated with poorly made optics or collimation errors.
출처: www.astrostuff.com/OPTICAL_TERMS.htm
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| astigmatism |
A condition where the cornea is irregularly shaped, causing distorted vision especially at near distances. Either glasses or toric contact lenses can correct astigmatism for most people. Small amounts of astigmatism may be correctable with regular oxygen permeable lenses.
출처: www.discounted-contact-lenses-online.com/glossary-...
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| astigmatism |
If the shape of the cornea is perfectly spherical there is no astigmatism. However, most corneas are not spherical but rather like the back side of a spoon. If you look at a spoon you see that the shape across the spoon is more curved than the shape along the spoon. The greater the difference between the two curves the more astigmatism. The amount of astigmatism is measured during an eye examination. Astigmatism can be corrected with Laser Vision Correction Techniques.
출처: www.citylaser.com/glossary.html
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