Table 2

Mean difference between repeat measurements, repeatibility coefficients, and intraclass correlation coefficients for each method of cataract grading. (Calculated on 113 eyes, each measured twice)

Laser slit lampLOCS III score
pixel intensity Nuclear colour Nuclear opalescence
Mean difference (session 2–session 1) (95% CI) 0.40 (−0.24–1.04) 0.06 (−0.01–0.13) 0.06 (−0.01–0.14)
Intraclass correlation (%) (95% CI)
Healthy subjects38.6 (12.9–59.2)82.3 (71.1–89.4)76.1 (62.3–85.4)
Cataract subjects94.7 (91.2–96.9)94.1 (90.2–96.4)93.5 (89.4–96.1)
All subjects95.0 (92.9–96.5)96.7 (95.3–97.8)97.0 (95.6–97.9)