A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea.[1] It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region.[2] The appearance and visibility of the limbal ring can be negatively affected by a variety of medical conditions concerning the peripheral cornea.[3] It has been suggested that limbal ring thickness may correlate with health or youthfulness and may contribute to facial attractiveness.[3][4] The thickness of the limbal ring varies by pupil dilation - when the pupil is larger, the limbal ring narrows.[5] Some contact lenses are colored to simulate limbal rings.[1]
- ^ a b Johnson and Johnson Vision Care Inc. Tinted contact lenses with combined limbal ring and iris patterns. US7246903B2. United States Patent and Trademark Office, July 24, 2007.
- ^ Shyu, Betsy P.; Wyatt, Harry J. (2009). "Appearance of the Human Eye: Optical Contributions to the 'Limbal Ring'". Optometry and Vision Science. 86 (9): E1069–77. doi:10.1097/OPX.0b013e3181b4f010. PMID 19648842. S2CID 39174174.
- ^ a b Peshek D, Semmaknejad N, Hoffman D, Foley P (2011). "Preliminary evidence that the limbal ring influences facial attractiveness" (PDF). Evolutionary Psychology. 9 (2): 137–146. doi:10.1177/147470491100900201. PMID 22947961.
- ^ Brown M, Sacco DF (2018). "Put a (Limbal) Ring on It: Women Perceive Men's Limbal Rings as a Health Cue in Short-Term Mating Domains". Pers Soc Psychol Bull. 44 (1): 80–91. doi:10.1177/0146167217733072. PMID 28978250.
- ^ Shyu, Betsy P.; Wyatt, Harry J. (September 2009). "Appearance of the Human Eye: Optical Contributions to the "Limbal Ring"". Optometry and Vision Science. 86 (9): E1069–E1077. doi:10.1097/OPX.0b013e3181b4f010. ISSN 1040-5488.