Pterygium is a common external ocular disease with prevalence
ranging between 0.7% and 33% globally [1]. The disease
is described as a wing-shaped, oriented fibrovascular lesion
that crosses the nasal or temporal limbus and can result
in obvious cosmetic problems, significant astigmatism, and
visual impairment or blindness due to interference with
visual axis. Surgery is warranted for pterygium approaching
the central part of the cornea. Unfortunately, the recurrence
rate after the surgery is between 30% and 90% [2]. Numerous
theories regarding the pathogenesis of pterygium included
genetic, environmental, infective, and immunological factors
[3]. Although the hypothesis implicating ultraviolet radiation
(UVR) as a risk factor has been well studied in populationbased
studies, case-control studies, and laboratory studies,
the definitive cause of pterygium is not well understood