Sulman Jaffar, Ukasha Dukht, Farwa Rizvi.
Impact of pterygium size on corneal topography.
Rawal Med J Jan ;34(2):145-7.

Objectives: To correlate pterygium size and induced corneal astigmatism using a computerized corneal topographic analysis system. Patients and Methods This study was conducted at Al-Shifa Eye Trust Hospital, Rawalpindi from May 2004 to November 2004. In one eye of 60 patients with primary pterygium, size of Pterygium was measured in millimeters from the limbus (horizontal length) by the beam of a Hag-Streit 900 Slit Lamp Microscope. Corneal astigmatism (diopters) was measured with the help of Video Keratoscope model: HS-Keratograph CTK 992 (HAAG-STREIT). Results: There were 48 (80%) males and 12 (20%) females. In Group A, the mean size of pterygium was 1.24mm±0.379 and mean astigmatism was –1.165D±0.849 SD (p=0.076). In Group B, the mean pterygium size was 2.84mm±0.557 and mean astigmatism was –3.46D±1.441 SD (p=0.01). In Group C, the mean pterygium size was 4.833mm ±0.586 and mean astigmatism was –5.9D±0.265 SD (p=0.05). There were 37 eyes (61.7%) in Group A, 20 eyes (33.3%) in Group B and 3 eyes (5%) in Group C. Conclusion: Pterygium size has direct correlation to the amount of induced astigmatism. The correlation is stronger in the pterygia of moderately advanced group (Group B, 2.1-4mm) as in this group the pterygium starts encroaching on the visual axis.

PakMediNet -Pakistan's largest Database of Pakistani Medical Journals - http://www.pakmedinet.com