Contact lens (CL) wearers' lens care habits are critical in lowering the risk of contact lens problems. The general Saudi population has limited knowledge of CLs practice. This study aimed to determine the prevalence of CL's usage, knowledge, practice and complications among adolescents and adults in Jeddah, Saudi Arabia. Method: A cross-sectional study was done and data about participants' demographics, wearing contact lenses and knowledge about factors that increases or decreases the risk of experiencing a contact lens related complication and practice related to CL use were collected. Result: 89.7% of the participants were females and 85.2% had an age> 18 years. The prevalence of CL use was 64%, 61.2% were using it for cosmetic purposes and 52.1% bought the CL from an optician. The commonly known CL complications were related to sleeping or swimming with lenses. Female participants and those who received information about lens care and hygiene had a significantly higher mean knowledge score about to CL use.Additionally, those who did not have eye infections and who received information on lens care and hygiene had a significantly higher mean practice score. CLs users who had non complications had a significant higher practice score compared to those with no complications. Conclusions: Although the majority of participants had knowledge, there is still poor hygienic practice.Raising awareness of Saudi community about CLs wearing hygiene is needed.