oblique astigmatism


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oblique astigmatism

[ə¦blēk ə′stig·mə‚tiz·əm]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The astigmatic orientation of the cornea in the total cohort of MFS patients tended to shift from WTR to ATR or oblique astigmatism with advancing age, consistent with previous studies of healthy eyes [27, 28].
The age wise distribution of the type of astigmatism in which the type of astigmatism most frequently found in the sample irrespective of the gender was WTR astigmatism for younger age groups, being most frequent in 26-35 years sub-group of age (n=21; 55%), and as the age group increased, ATR and oblique astigmatism were seen in the subjects (Table-1).
The oblique astigmatism introduced by the off-axis patterns while recording the hologram is limited to 0.17 D, which is acceptable in clinical practice where a margin or error of [+ or -]0.25 D is allowed.
We performed the same analysis for subgroups of eyes with preoperative WTR (n = 47) and ATR (n = 12) and oblique astigmatism (n = 5).