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Yumi Hasegawa, Takahiro Hiraoka, Mariko Seki, Shinichiro Nakano, Tetsuro Oshika; Effects of Calculator with Posterior Corneal Astigmatism on Toric Intraocular Lens Selection and Simulated Residual Astigmatism. Invest. Ophthalmol. Vis. Sci. 2018;59(9):2217.
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© ARVO (1962-2015); The Authors (2016-present)
AMO toric calculator has been added posterior corneal astigmatism (PCA) option. The purpose of this study was to compare simulated residual astigmatism calculated by Keratometric power with and without PCA and Real Power in patients with toric intraocular lenses (T-IOLs).
This study included 85 eyes of 60 patients (mean age 73.9 ± 7.7 years) undergoing cataract surgery with TECNIS Toric OptiBlue (AMO) implantation. Preoperative corneal astigmatism was measured using automated keratometry (Keratometric power) and anterior segment optical coherence tomography (Real Power). Simulated residual astigmatism was calculated based on the postoperative T-IOL implanted power and axis, actual residual astigmatism power and axis, and simulated T-IOL implanted power and axis. We calculated simulated T-IOL implanted power and axis by three methods: (1) Keratometric power without PCA, (2) Keratometric power with PCA, (3) Real Power. We compared simulated residual astigmatism calculated by three methods.
Simulated residual astigmatism based on Keratometric power without PCA, Keratometric power with PCA and Real Power was 0.95 ± 0.81 D, 0.86 ± 0.81 D and 0.66 ± 0.65 D, respectively. Simulated residual astigmatism based on Keratometric power without PCA was significantly higher than that based on Real Power (p < 0.05, Fisher’s PLSD), whereas there was no significant difference between simulated residual astigmatism based on Keratometric power with PCA and Real Power. When compared in astigmatic type (against-the-rule and with-the-rule astigmatism), similar results were observed.
If there was no biometry device for measuring posterior corneal astigmatism, PCA option is effective to implant T-IOLs for the cataract patients with astigmatism.
This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.
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