In their recent article on corneal asphericity after surgery, Bottos et al. present changes in Q (corneal asphericity) for myopic and hyperopic corrections, indicating that Q values tend to become more positive after myopic ablation and more negative after hyperopic ablation. Such trends have been shown and explained. The previous articles also provide equations that explain the tendencies in postsurgical corneal asphericity shown by Bottos et al. and the fact that the greater the initial degree of ametropia, the greater the asphericity changes.
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