C Kern1, L El Kaissi2, K Kortuem2, M Shajari2, E Vounotrypidis2, A Langenbucher3, S Priglinger2, W J Mayer2. 1. Department of Ophthalmology, University Hospital, LMU Munich, Mathildenstraße 8, 80336, Munich, Germany. Christoph.kern@med.uni-muenchen.de. 2. Department of Ophthalmology, University Hospital, LMU Munich, Mathildenstraße 8, 80336, Munich, Germany. 3. Institute of Experimental Ophthalmology, Saarland University, Saarbrücken, Germany.
Abstract
PURPOSE: To evaluate refractive outcomes for a standard industry calculator using anterior corneal astigmatism or total corneal refractive power. METHODS: This prospective interventional study evaluated the refractive outcomes of 56 eyes using a standard industry calculator (Zeiss ZCalc) and a digital IOL alignment software. After A-constant optimisation the ZCalc was recalculated with two different keratometry values using appropriate refractive indices: anterior corneal astigmatism (ACA) by IOLMaster 700 and total corneal refractive power (TCRP) by Pentacam. The Barrett toric calculator was used as a reference. RESULTS: Undercorrection of 0.04 ± 0.42 D after 1 week and 0.13 ± 0.48 D after 3 months was achieved for the spherical equivalent by using a standard industry calculator. IOL misalignment was 2.8° ± 3.4° using a digital alignment system. For the ZCalc, the mean absolute error could be reduced from 0.19 ± 0.40 D using ACA to 0.04 ± 0.48 D when considering total corneal refractive power (p = 0.06). The Barrett calculator delivered better refractive outcomes than using a standard industry calculator with ACA measurements only (- 0.06 ± 0.43 D; p < 0.01). CONCLUSION: Reliable and accurate refractive outcomes in toric IOL calculation were achieved by using the ZCalc calculator. The prediction error for a widely used standard industry toric IOL calculator could be reduced by using measured total corneal refractive power.
PURPOSE: To evaluate refractive outcomes for a standard industry calculator using anterior corneal astigmatism or total corneal refractive power. METHODS: This prospective interventional study evaluated the refractive outcomes of 56 eyes using a standard industry calculator (Zeiss ZCalc) and a digital IOL alignment software. After A-constant optimisation the ZCalc was recalculated with two different keratometry values using appropriate refractive indices: anterior corneal astigmatism (ACA) by IOLMaster 700 and total corneal refractive power (TCRP) by Pentacam. The Barrett toric calculator was used as a reference. RESULTS: Undercorrection of 0.04 ± 0.42 D after 1 week and 0.13 ± 0.48 D after 3 months was achieved for the spherical equivalent by using a standard industry calculator. IOL misalignment was 2.8° ± 3.4° using a digital alignment system. For the ZCalc, the mean absolute error could be reduced from 0.19 ± 0.40 D using ACA to 0.04 ± 0.48 D when considering total corneal refractive power (p = 0.06). The Barrett calculator delivered better refractive outcomes than using a standard industry calculator with ACA measurements only (- 0.06 ± 0.43 D; p < 0.01). CONCLUSION: Reliable and accurate refractive outcomes in toric IOL calculation were achieved by using the ZCalc calculator. The prediction error for a widely used standard industry toric IOL calculator could be reduced by using measured total corneal refractive power.
Authors: Karsten U Kortüm; Michael Müller; Christoph Kern; Alexander Babenko; Wolfgang J Mayer; Anselm Kampik; Thomas C Kreutzer; Siegfried Priglinger; Christoph Hirneiss Journal: Am J Ophthalmol Date: 2017-03-30 Impact factor: 5.258
Authors: Douglas D Koch; Shazia F Ali; Mitchell P Weikert; Mariko Shirayama; Richard Jenkins; Li Wang Journal: J Cataract Refract Surg Date: 2012-10-12 Impact factor: 3.351