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Maolong Tang, Li Wang, Douglas D. Koch, Yan Li, David Huang; Intraocular Lens Power Calculation after Myopic or Hyperopic Laser Vision Correction Using Optical Coherence Tomography. Invest. Ophthalmol. Vis. Sci. 2012;53(14):3612.
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To use optical coherence tomography (OCT) to measure corneal power and calculate intraocular lens (IOL) power in cataract surgeries after myopic or hyperopic laser vision correction (LVC).
Patients with previous myopic or hyperopic LVC were enrolled in this prospective study at two centers (Doheny Eye Institute, Los Angeles, CA, Cullen Eye Institute, Houston, TX and Casey Eye Institute, Portland, OR). Corneal power was measured with a Fourier-domain OCT system. Axial length, anterior chamber depth, and automated keratometry were measured with the IOLMaster. An OCT-based IOL formula was developed. The mean absolute error (MAE) of refractive prediction for OCT-based IOL formula was calculated. The results were compared with the MAE for Haigis-L formula.
A total of 39 eyes of 39 subjects who had uncomplicated cataract surgery with monofocal IOL implantation were enrolled in the 3 sites. Thirty-one eyes had previous myopic LVC ranged from -12.46 D to -0.88 D. Eight eyes had previous hyperopic LVC ranged from 0.66D to 5.52D. For the myopic LVC group, the OCT formula had a MAE of 0.63 D compared to an MAE of 0.68 D for the Haigis-L formula (p = 0.74). For the hyperopic LVC group, the MAE for OCT and Haigis-L formula was 0.26 D and 0.54 D respectively (p > 0.05).
The predictive accuracy of OCT-based IOL power calculation is equivalent to current standards for post-LVC eyes. More eyes are being enrolled, and updated results will be presented at the meeting.
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