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Correlation between size of pterygium and corneal astigmatism

Poster Details

First Author: N.Kanchanaranya THAILAND

Co Author(s):                  

Abstract Details


To study the relationship between the size of the pterygium on corneal surface with preoperative astigmatism and the result of astigmatism change after pterygium excision. In addition to measure the size of pterygium that affects change of astigmatism significantly after surgery.


This study included patients between 20-70 year-old with pterygium who underwent eye examination and pterygium excision at the eye clinic, Thammasat University Hospital were included in the present study during May to November 2014.


The pterygium preoperative size and astigmatism by autorefractor keratometer were measured, as well as postoperative astigmatism at 1 month and 3 months.


There were 103 patients with 44 male (42.72%), 59 female (52.28%). Areas of pterygium 3 to 35 mm2 and horizontal size 1.5-6.5 mm causing the astigmatism size 0 to 12.75 diopter were discovered. The area of preoperative pterygium is significantly associated with astigmatism (p-value <0.001). Following surgery, measurements obtained included reduced astigmatism at 1 month (1.44 ± 2.23 diopter) and 3 months (1.83 ± 2.47 diopter). Extension of pterygium exceeded 7.025 mm2 (74 % of sensitivity, 59% of specificity) and 2.85 mm (80% of sensitivity, 52% of specificity) correlated a chance of reduction of astigmatism.


Area of preoperative pterygium greater than 7.025 mm2 and 2.85 mm in horizontal size will affect the maximum reduction of astigmatism (1.83 Diopter). This may be useful in patient selection for pterygium excision. FINANCIAL DISCLOUSRE: NONE

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