Pterygium is a pinkish, triangular tissue growth on the cornea of the eye. The cause of pterygium is unclear but there is a strong correlation of its incidence with UV-B light. The aim of this study is to find out the incidence of pterygium in a tertiary care hospital and also find whether it is associated with UV- B radiation. The methodology of the study involves finding the incidence of pterygium by physical examination using a slit lamp. Once the incidence of pterygium is found then its correlation to working outdoors is calculated by taking occupational history of the patients. Then analysis is done to find any significant association. Out of the 150 patients who were included in the study, there were 75 males and 75 females. Of those examined, 26 were to diagnosed of having pterygium. Of those diagnosed of having pterygium, 17 were males and 9 were females. The average age of the subjects with pterygium recruited for this study was 38.9 years. The conclusion of the study is that there is clear association between the incidence of pterygium and exposure to UV radiation.