Toric IOLs improve astigmatism after myopic, hyperopic laser surgery
Patients who had underwent toric IOL implantation after previous excimer laser corneal refractive surgery showed significantly decreased astigmatism.
“Correcting corneal astigmatism in post-LASIK eyes can be challenging due to the presence of varying amounts of irregular astigmatism,” Danmin Cao, MD, from Baylor College of Medicine, Houston, Texas, and colleagues wrote. “To obtain optimal results with toric IOLs in eyes with previous LASIK/PRK, it is paramount to carefully assess the preoperative corneal astigmatism.”
The study involved 75 eyes, including 47 patients who had previous myopic LASIK/PRK and 16 patients who had previous hyperopic LASIK/PRK.
Preoperatively, the mean magnitudes of corneal astigmatism were 1.34 D among the myopic treatment group and 1.66 among the hyperopic treatment group. After toric IOL implantation, the mean magnitude values of refractive astigmatism significantly decreased to 0.36 D and 0.34 D, respectively.
The preoperative centroids of corneal astigmatism were 0.31 D at 19 degrees in the myopic treatment group and 0.74 D at 92 degrees in the hyperopic treatment group. Postoperatively, the centroids of refractive astigmatism significantly decreased to 0.12 D at 152 degrees and 0.05 D at 172 degrees, respectively.
“In our study, compared with the preoperative corneal astigmatism, the magnitude of postoperative refractive astigmatism was significantly decreased, and the percentages of eyes with astigmatism 0.50 D [or less] and 1.00 D [or less] significantly increased in both myopic and hyperopic LASIK/PRK groups,” Cao and colleagues wrote.