K nowledge about contact lens use and ocular irritation in senior high schoolstudentsBackground of The StudyEye irritation can occur at various ages, one of them are the teenagers. One of thefactors that can cause eye irritation is the use of non hygienic contact lenses.Teenagers often use contact lenses for cosmetic needs and are not accompanied bythe knowledge of proper use and care of contact lenses. The purpose of this studywas to determine the relationship between knowledge level of contact lens wearand eye irritation in high school students.MethodThis research used observational analysis study with the research method designwas using Cross-Sectional towards the students in SMAN 23 Jakarta. In collectingthe data, the writer used the interview and the questionnaire about the knowledgeof wear, the treatment of the contact lens and the eyes irritation towards thestudents in Senior High School. In analyzing the data, the writer used SPSS 22.0version and the level significant is 0,05.ResultFrom the result of the research with 81 respondents, the Chi-Square analysisshowed that there was the correlation between the knowledge level of contact lenswear and eyes irritation with p-value 0,031.ConclusionAfter conducting the research, the writer can conclude that the students in SeniorHigh School, who has less knowledge of contact lens wear, experienced the eyesirritation..