A prospective study on the epidemiology of pterygium was done in the department of Ophthalmology, D.H.Q. Teaching Hospital, D. I. Khan from 1 August 2001 to 31st July 2002. Each patient had a complete ophthalmological examination and all information were recorded in a specially designed proforma. In our study we examined 120 patients with 170 pterygia. 95 (79.16%) patients were male, while 25 (20.84%) were females. Male to female ratio was 3.8:1. Majority of patients [33 (27.5%)] presented between 31 and 40 years of age: The age range was 21 to 75 years and average age was 43 years. The most common complaint at the time of presentation was recurrent soreness (59 patients-49.16%) of the eyes. The vast majority of patients were outdoor workers (93 patients-77.5%) with a positive history of U-V rays exposure. 84(70%) patients had only single nasal pterygium, while 36(30%) patients had two or more pterygia at the time of presentation. Out of 170 pterygia, 122(71.77%) were actively growing, red and fleshy, while 48 (28.23%) were slow growing, stationary or atrophic. In 145 (8.5.29%) cases pterygia were fully developed at the time of presentation, while 25 (14.71 %) were just covering the limbus. Out of 170 pterygia, 148 (87.05%) were located on the nasal side of the cornea and 22 (12.95%) were temporally located. None of the temporal pterygia was without the presence of its nasal counterpart.