Effects of aging on anterior and posterior corneal astigmatism

Jau D. Ho, Shiow W. Liou, Jui-Fang Tsai, Ching Y. Tsai

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

PURPOSE:: To evaluate age-related changes in astigmatism of both corneal surfaces and the whole cornea. METHODS:: The right eyes of 370 subjects were measured with a rotating Scheimpflug camera (Pentacam). Astigmatisms of the anterior and posterior corneal surfaces were determined. The total corneal astigmatism was derived using power vector summation and vergence tracing. Age-related changes to corneal astigmatism were evaluated using polar value analysis (both in diopter and millimeter). RESULTS:: For the anterior and total cornea, the proportion of with-the-rule astigmatisms decreased and those of oblique and against-the-rule astigmatisms increased with age. For the posterior cornea, most eyes displayed against-the-rule astigmatisms in all age groups. There was a significant trend toward against-the-rule astigmatism associated with increasing age for both anterior and total corneal astigmatisms (mean changes of -0.18 and -0.16 diopters/5 years, respectively), and toward with the rule in posterior corneal astigmatism (a mean change of 0.022 diopters/5 years). Regarding shape changes, a "flat meridian toward a more vertical orientation" trend with increasing age for both the anterior and posterior corneal surfaces was observed (mean changes of 0.0295 and 0.0224 mm/5 years, respectively). The posterior corneal surface compensated for the astigmatism arising from the anterior corneal surface in 91.4% and 47.7% of eyes in the 21-30 and ≥ 71 years groups, respectively. CONCLUSIONS:: There were age-related shifts toward against-the-rule and with-the-rule astigmatisms for the anterior and posterior corneal surfaces, respectively. The compensating effects of the posterior corneal surface on anterior corneal astigmatism decreased with advancing age.

Original languageEnglish
Pages (from-to)632-637
Number of pages6
JournalCornea
Volume29
Issue number6
DOIs
Publication statusPublished - Jun 2010

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Astigmatism
Cornea
Meridians
Age Groups

Keywords

  • Aging effect
  • Astigmatism
  • Pentacam
  • Posterior corneal surface

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Effects of aging on anterior and posterior corneal astigmatism. / Ho, Jau D.; Liou, Shiow W.; Tsai, Jui-Fang; Tsai, Ching Y.

In: Cornea, Vol. 29, No. 6, 06.2010, p. 632-637.

Research output: Contribution to journalArticle

Ho, Jau D. ; Liou, Shiow W. ; Tsai, Jui-Fang ; Tsai, Ching Y. / Effects of aging on anterior and posterior corneal astigmatism. In: Cornea. 2010 ; Vol. 29, No. 6. pp. 632-637.
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KW - Aging effect

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KW - Posterior corneal surface

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