| 21. | Types of ametropia include myopia, hyperopia and astigmatism.
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| 22. | Whether or not El Greco had progressive astigmatism is still open to debate.
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| 23. | This focus is free of astigmatism, which grows quadratically with field angle.
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| 24. | The infants were shown diagonal and horizontal or vertical lines to study astigmatism.
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| 25. | The Visx laser can be modified for astigmatism surgery simply by changing its software.
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| 26. | Astigmatism occurs when the eye can't focus because its cornea is misshapen.
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| 27. | And Salz and others are now conducting trials to correct farsightedness complicated by astigmatism.
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| 28. | Q . What is astigmatism and did it affect the work of El Greco?
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| 29. | Conventional spectacles correct for poor focusing and astigmatism in the eye's lens.
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| 30. | However, such designs still suffer from astigmatism.
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