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References
1.College of Optometrists (2018). Pterygium. Available at: https://www.college-optometrists.org/guidance/clinical-management-guidelines/pterygium.html .
2.Guy’s and St Thomas’ (2018) Pterygium. Available at: www.guysandstthomas.nhs.uk/resources/patient-information/eye/pterygium.pdf (accessed 2 May 2020) .
3.Specsavers. Pinguecula. Available at: www.specsavers.co.uk/eye-health/pinguecula (accessed 2 May 2020) .