Observer 1 | Observer 2 | |||||
---|---|---|---|---|---|---|
Button | Mean | SD | Mean | SD | ||
1 | 1.125 | 0.354 | 1.0 | 0 | ||
2 | 2.0 | 0.535 | 2.75 | 0.463 | ||
3 | 3.125 | 0.641 | 3.0 | 0.756 | ||
4 | 4.25 | 0.707 | 4.125 | 0.835 | ||
5 | 5.25 | 0.463 | 4.75 | 0.707 | ||
6 | 5.75 | 0.707 | 6.0 | 0 | ||
No significant difference between observers (p = 1.0, ANOVA). | ||||||
(B) The mean and standard deviation (SD) of four measurements of the astigmatism of six toric backcut contact lens blanks (buttons) by two observers using the Bausch & Lomb keratometer (observer 1 was a novice, observer 2 an experienced user) | ||||||
Observer 1 | Observer 2 | |||||
Button | Mean | SD | Mean | SD | ||
1 | 0.312 | 0.217 | 0.625 | 0.27 | ||
2 | 1.406 | 0.062 | 1.656 | 0.213 | ||
3 | 2.594 | 0.188 | 3.125 | 0.102 | ||
4 | 3.531 | 0.461 | 3.781 | 0.062 | ||
5 | 4.875 | 0.177 | 4.769 | 0.208 | ||
6 | 5.219 | 0.258 | 5.95 | 0.316 |
No significant difference between observers (p = 0.953, ANOVA).
Intraclass correlation coefficient of reliability (between observers): KAR, R = 0.898 (95% CI >0.781), B&L, R = 0.975 (95% CI >0.633).
Coefficient of variation: KAR = 0.073, B&L = 0.094.