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The threshold and three-component model. (A) High M leads to a high probability of achieving effective control whether the ring is flat or uneven. (B) Low M leads to a low probability of achieving effective control whether the ring is flat or uneven. (C) Medium M combined with a flat ring has a low probability of achieving effective control. (D) Medium M combined with an uneven ring increases the probability of achieving effective control. EC, effective control of myopic progression.
