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Ratio of keratometric change to refractive change differs in change of spherical equivalent
As refractive change increases, the change in simulated keratometry required to achieve 1.00 D of myopic refractive correction decreases, according to a study.
The retrospective review included 3,337 eyes that underwent LASIK or PRK. The ratio of keratometric change to refractive change was measured postoperatively at 3 months.
This data was compared between eyes with low (0.00 D to 2.99 D), moderate (3.00 D to 5.99 D) and high (6.00 D to 8.99 D) absolute change in spherical equivalent.
In the ratio of keratometric change to refractive change, significant differences were identified in all eyes when compared to absolute change in spherical equivalent (P < .001).
Regardless of preoperative keratometry, a significant difference in the ratio of keratometric change to refractive change also existed in all eyes (P < .028).