Table 6

Distribution of contact lens (CL) types among AK patients

% CL types in population: Year: Sample size:
AK cases CL use: (1 October 1997 to 30 September 1999)199717199818199919
(n=93)(n=1382)(n=1947)(n=1419)Total (n=4748)
*Daily disposable v other SCL schedules (excluding unknown): χ2 = 10.122, p = 0.00; †1–4 weekly disposal v other SCL schedules (excluding unknown): χ2 = 16.569, p = 0.00; ‡rigid CL v SCL (including unknown SCL schedules): χ2 = 2.064, p = 0.14.
SCL:
    Daily disposable 5 (5%)*12%23%24% 954 (20%)*
    Disposable 1–4 weeks46 (60%)†37%36%37%1737 (37%)†
    Disposable >4 weeks15 (19%)34%24%19%1207 (25%)
    Unknown disposable14 (15%)0%0%0% 0
    Soft-rigid 2 (2%)0%0%0% 0
    Rigid CL11 (12%)‡17%17%20%850 (18%)‡