From: The use of intracorneal ring segments in keratoconus
Visual Acuity
Gain ≥ 1 line CDVA
Lost ≥ 1 line CDVA
Lost ≥ 2 lines CDVA
CDVA ≥ 0.6
GRADE I + II
37.90 %
36.29 %
25.80 %
CDVA ≤ 0.4
GRADE IV + PLUS
82.85 %
10.00 %
4.28 %