Pterygium is a wing-shaped, fibrovascular degeneration of the bulbar conjunctiva that grows toward and over the cornea. It may cause irregular astigmatism, visual impairment, irritation, and cosmetic problems. Dryness, inflammation, and exposure to wind and dust or other irritants may be risk factors for its development but its pathogenesis is most strongly correlated with ultraviolet exposure making it more common in tropical countries near the equator (Agahan, 2010., Al-Bdour, 2004., Cajucom Uy, 2010., Chen, 2015., Droutsas, 2010., Essuman, 2014., Fernandes, 2005). It has also been reported several times that increasing age, male gender, outdoor occupation, and systemic factors like hypertension are risk factors suggesting a multifactorial etiology for this condition (Gris, 2000., Küçükerdönmez, 2007., Kurna, 2013). In a systematic review and meta-analysis done by Liu et al which included 20 countries, the geographic pooled prevalence rate of pterygium was around 10% in the general population (Essuman, 2014).
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