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목적 : To report significant ocular residual astigmatism (ORA) after cataract surgery and propose corneal irregularity as a risk factor
방법 : Five cases of significant ORA after cataract surgery were selected from review of 251 uncomplicated cataract surgeries. Corneal irregularity by Fourier analysis was measured by Pentacam (Oculus Inc., Wetzlar, Germany). Automated keratometry (AK), simulated keratometry (simK), true net power (TNP, 3 or 4mm, ring or zone), and total corneal refractive power (TCRP, 3 or 4mm, ring or zone) were measured both pre- and post-operatively. Refractive astigmatism (RA) measured at least 6 months after surgery was compared with various keratometries.
결과 : The mean corneal irregularity in eyes with significant ORA was measured as 0.133±0.032 (range 0.112 to 0.190) which was beyond the 95% confidence interval of mean corneal irregularity of 251 eyes (0.040±0.019). Preoperatively, corneal astigmatism measured by AK or simK failed to predict the postoperative RA in these highly irregular corneas. TCRP4zone forewarned these corneas by giving the largest preoperative corneal astigmatism. Postoperatively, TNP4ring, TCRP4zone and TCRP4ring showed no significant difference when compared to RA.
결론 : High corneal irregularity in Fourier analysis by Pentacam can be a risk factor of significant ORA after cataract surgery. In highly irregular corneas, we found that TNP4 or TCRP4 can be selected to better predict postoperative refractive astigmatism.
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