Relationship between pterygium and corneal astigmatism

Objective:To observe the correlation between pterygium size and corneal astigmatism and study the opportunity and necessity of operation.Methods:63eyes with primary pterygium were evaluated according to measurement of visual acuity,diopter,corneal curvature and pterygium size,among them preoperative data of51eyes were compared with those of the postoperative finding.Results:Various degrees of astigˉmatismwere determined in58eyes.The astigmatismwas associated with the lenghth of pterygium into the cornea,with regular astigmatism as the main type.Conclusion:The operation of pterygium can obviously improve the status of corneal astigmatism.Once the pterygium extends2.5～3.0mm into the cornea,it is the crucial time to perform the operation.