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. 2021 Jul 7;100(2):175–182. doi: 10.1111/aos.14911

Table 4.

Efron Grading Scale for Contact Lens Complications for corneal staining at follow‐up visits for right and left eyes.

Follow‐up D3 (n 21) D7 (n 21) M01 (n 21) M03 (n 21) M06 (n 21) M09 (n 21) M12 (n 20) M15 (n 19) M18 (n 19)
Grade Dxt Sin Dxt Sin Dxt Sin Dxt Sin Dxt Sin Dxt Sin Dxt Sin Dxt Sin Dxt Sin
0 13 12 11 13 11 14 14 13 12 12 10 13 8 12 15 12 16 16
1 8 8 10 8 9 7 4 7 8 8 8 7 9 8 4 7 1 3
2 0 1 0 0 1 0 3 1 1 1 3 1 3 0 0 0 1 0
3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

D = day; Dxt = right eye; M = month; Sin = left eye.