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Summary of criteria for keratoconus progression
SimK = simulated K; NS = not stated; CK = central K; I-S = inferior minus superior asymmetry; KISA = (CK) × (I-S) × (SimK1 - SimK2) × (skewed radial axis) × 100/300.
*Lens-wearing group/control group; †Keratoconus relatives/normal controls.
