Effect of the retention ring-assisted continuous application of riboflavin in pulsed-light accelerated corneal collagen cross-linking on the progression of keratoconus.

The best corrected visual acuity gradually improved from preoperative 0.43 ± 0.43 logMAR to 0.17 ± 0.16 logMAR at 12 months with a marginal significance ( p = 0.050) (Fig. 1a ) and uncorrected visual acuity also improved, from 0.81 ± 0.38 logMAR to 0.49 ± 0.50 logMAR at 12 months, although it was not statistically significant ( p = 0.635) (Fig. 1b ).

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