Effects of Aging on Anterior and Posterior Corneal Astigmatism

被引:112
作者
Ho, Jau-Der [2 ,3 ]
Liou, Shiow-Wen [1 ,3 ,4 ]
Tsai, Ray Jui-Fang [3 ]
Tsai, Ching-Yao [1 ,5 ,6 ]
机构
[1] Taipei City Hosp, Dept Ophthalmol, Taipei 103, Taiwan
[2] Taipei Med Univ Hosp, Dept Ophthalmol, Taipei, Taiwan
[3] Taipei Med Univ, Dept Ophthalmol, Taipei, Taiwan
[4] Natl Taiwan Univ Hosp, Dept Ophthalmol, Taipei, Taiwan
[5] Natl Yang Ming Univ, Community Med Res Ctr, Taipei 112, Taiwan
[6] Natl Yang Ming Univ, Inst Publ Hlth, Taipei 112, Taiwan
关键词
astigmatism; aging effect; pentacam; posterior corneal surface; DIURNAL-VARIATION; THICKNESS; POWER; POPULATION; TORICITY; PENTACAM; SURFACE; SHAPE;
D O I
10.1097/ICO.0b013e3181c2965f
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
Purpose: To evaluate age-related changes in astigmatism of both conical 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.
引用
收藏
页码:632 / 637
页数:6
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