Ophthalmology / Adolescent / Conjunctiva / HUMAN PAPILLOMAVIRUS / Humans / Virus / Polymerase Chain Reaction / Frequency / Clinical Sciences / Aged / Middle Aged / Optometry and Ophthalmology / Adult / Public health systems and services research / Normal / Virus / Polymerase Chain Reaction / Frequency / Clinical Sciences / Aged / Middle Aged / Optometry and Ophthalmology / Adult / Public health systems and services research / Normal