The population with a lifetime exposure >12 lifetime hours (extreme exposure group), compared to the population with a lifetime exposure ≤3 lifetime hours(lower exposure group), had a 3.05–fold higher likelihood of being in the 5–7 OSS group (95% CI 1.51–6.19). After excluding contact lens users, the extreme exposure group had a 2.95-fold higher likelihood of being in the 5–7 OSS group (95% CI 1.39–6.27)