Abstract：
OBJECTIVE:To evaluate prospectively the corneal refractive status before and after pterygium surgery and its relationship with preoperative pterygium size. DESIGN:Prospective, nonrandomized, comparative (self-controlled) trial. PARTICIPANTS:One hundred thirty-six eyes undergoing primary pterygium removal surgery. MAIN OUTCOME MEASURES:Corneal spherical power, astigmatism, surface regularity index (SRI), and surface asymmetry index (SAI) before and after surgery, and the preoperative pterygium size. RESULTS:Before surgery, pterygium size significantly correlated with spherical power (Pearson's correlation coefficient, r = -0.370, P < 0.001), astigmatism (r = 0.600, P < 0.001), SRI (r = 0.367, P < 0.001), and SAI (r = 0.387, P < 0.001). The surgery significantly increased spherical power of the cornea, whereas astigmatism, SRI, and SAI were significantly decreased by the surgery (P < 0.01, paired t test with Bonferroni's correction of P value for multiple comparison). Surgically induced changes in spherical power (r = 0.598, P < 0.001) and astigmatism (r = 0.653, P < 0.001) significantly correlated with the preoperative pterygium size. Precise prediction of the magnitude of refractive changes based on the preoperative pterygium size was difficult. CONCLUSIONS:The presence of pterygium and its removal significantly influence the corneal refraction including spherical power, astigmatism, asymmetry, and irregularity, with the larger pterygium exerting the greater influence.
journal_name
Ophthalmologyjournal_title
Ophthalmologyauthors
Tomidokoro A,Miyata K,Sakaguchi Y,Samejima T,Tokunaga T,Oshika Tdoi
10.1016/s0161-6420(00)00219-0subject
Has Abstractpub_date
2000-08-01 00:00:00pages
1568-71issue
8eissn
0161-6420issn
1549-4713pii
S0161-6420(00)00219-0journal_volume
107pub_type
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