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An overall view of the growth process reveals a multiplicity of factors that are correlated and interrelated4. Recent evidence implicates anti-apoptotic mechanisms, immunological mechanisms, cytokines, growth factors, extracellular matrix modulators, genetic factors and viral infections, among other possible causative factors 5, 6. The prevalence rates vary widely (from 2% to 29%),7 but generally they are higher in the tropics than at temperate latitudes8,9. It is accepted that pterygium occurs in an equatorial belt delimited by Latitude 40N and S, associating it with ultra-violet light9-11. Prevalence increases geographically towards the equator and is greater in people exposed to outdoor environments12. In addition; there are associations with rural regions, increasing age and male gender, which correlate with outdoor work13.

Comparison between Sutureless and Glue Free versus Sutured Limbal Conjunctival Autograft in Primary Pterygium Surgery