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Labeling index of cyclically stretched lenses treated with and without verteporfin. Comparison of LEC labeling index of verteporfin and control lenses under a cyclic strain (6% strain amplitude, 0.20 Hz) regime. The control group had a mean labeling index of 6.30% ± 1.58%. The verteporfin treated group had a mean labeling index of 1.30% ± 0.33%. The results of a paired t-test had a P < 0.0001.
