Peripheral light focusing

Peripheral Light Focusing (PLF) can be described as the focusing of Solar Ultraviolet Radiation (SUVR) at the nasal limbus of the cornea.[1] SUVR incident at the temporal limbus passes across the corneal dome and focuses at the nasal limbus. The limbal region is a stem cell rich tissue. Ocular conditions such as pinguecula and pterygium may occur due to the result of this increased exposure to SUVR in limal area, but it is not the only cause of pterygium formation.[2]

References

Kwok, L. Stephen; Kuznetsov, Valerian A.; Ho, Arthur; Coroneo, Minas T. (2003-04-01). "Prevention of the Adverse Photic Effects of Peripheral Light-Focusing Using UV-Blocking Contact Lenses". Investigative Ophthalmology & Visual Science. 44 (4): 1501–1507. doi:10.1167/iovs.02-0380. ISSN 1552-5783. PMID 12657585.
King-Smith, P. Ewen; Mauger, Thomas F.; Begley, Carolyn G.; Tankam, Patrice (2020). "Optical Analysis and Reappraisal of the Peripheral Light Focusing Theory of Nasal Pterygia Formation". Investigative Ophthalmology & Visual Science. 61 (2): 42. doi:10.1167/iovs.61.2.42. ISSN 0146-0404. PMC 7329627. PMID 32106293.

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[1] Kwok, L. Stephen; Kuznetsov, Valerian A.; Ho, Arthur; Coroneo, Minas T. (2003-04-01). "Prevention of the Adverse Photic Effects of Peripheral Light-Focusing Using UV-Blocking Contact Lenses". Investigative Ophthalmology & Visual Science. 44 (4): 1501–1507. doi:10.1167/iovs.02-0380. ISSN 1552-5783. PMID 12657585.

[2] King-Smith, P. Ewen; Mauger, Thomas F.; Begley, Carolyn G.; Tankam, Patrice (2020). "Optical Analysis and Reappraisal of the Peripheral Light Focusing Theory of Nasal Pterygia Formation". Investigative Ophthalmology & Visual Science. 61 (2): 42. doi:10.1167/iovs.61.2.42. ISSN 0146-0404. PMC 7329627. PMID 32106293.