Refractive cylinder outcomes after calculating toric intraocular lens cylinder power using total corneal refractive power

Refractive cylinder outcomes after calculating toric intraocular lens cylinder power using total corneal refractive power

James A Davison,1 Richard Potvin21Wolfe Eye Clinic, Marshalltown, IA, USA; 2Science in Vision, Akron, NY, USAPurpose: To determine whether the total corneal refractive power (TCRP) value, which is based on measurement of both anterior and posterior corneal astigmatism, is effective for toric intraoc...

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Autores principales: Davison JA, Potvin R
Formato: article
Lenguaje:EN
Publicado: Dove Medical Press 2015
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Ophthalmology
RE1-994
Acceso en línea:https://doaj.org/article/0a55a64a92a64f36866bd348a2b3b71e
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spelling oai:doaj.org-article:0a55a64a92a64f36866bd348a2b3b71e2021-12-02T08:20:03ZRefractive cylinder outcomes after calculating toric intraocular lens cylinder power using total corneal refractive power1177-5483https://doaj.org/article/0a55a64a92a64f36866bd348a2b3b71e2015-08-01T00:00:00Zhttp://www.dovepress.com/refractive-cylinder-outcomes-after-calculating-toric-intraocular-lens--peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483James A Davison,1 Richard Potvin21Wolfe Eye Clinic, Marshalltown, IA, USA; 2Science in Vision, Akron, NY, USAPurpose: To determine whether the total corneal refractive power (TCRP) value, which is based on measurement of both anterior and posterior corneal astigmatism, is effective for toric intraocular lens (IOL) calculation with AcrySof® Toric IOLsPatients and methods: A consecutive series of cataract surgery cases with AcrySof toric IOL implantation was studied retrospectively. The IOLMaster® was used for calculation of IOL sphere, the Pentacam® TCRP 3.0 mm apex/ring value was used as the keratometry input to the AcrySof Toric IOL Calculator and the VERION™ Digital Marker for surgical orientation. The keratometry readings from the VERION reference unit were recorded but not used in the actual calculation. Vector differences between expected and actual residual refractive cylinder were calculated and compared to simulated vector errors using the collected VERION keratometry data.Results: In total, 83 eyes of 56 patients were analyzed. Residual refractive cylinder was 0.25 D or lower in 58% of eyes and 0.5 D or lower in 80% of eyes. The TCRP-based calculation resulted in a statistically significantly lower vector error (P<0.01) and significantly more eyes with a vector error ≤0.5 D relative to the VERION-based calculation (P=0.02). The TCRP and VERION keratometry readings suggested a different IOL toric power in 53/83 eyes. In these 53 eyes the TCRP vector error was lower in 28 cases, the VERION error was lower in five cases, and the error was equal in 20 cases. When the anterior cornea had with-the-rule astigmatism, the VERION was more likely to suggest a higher toric power and when the anterior cornea had against-the-rule astigmatism, the VERION was less likely to suggest a higher toric power.Conclusion: Using the TCRP keratometry measurement in the AcrySof toric calculator may improve overall postoperative refractive results. Consideration of measured posterior corneal astigmatism, rather than a population-averaged value, appears advantageous.Keywords: toric IOL, posterior corneal astigmatism, astigmatism, keratometry, biometry, TCRPDavison JAPotvin RDove Medical PressarticleOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2015, Iss default, Pp 1511-1517 (2015)
institution DOAJ
collection DOAJ
language EN
topic Ophthalmology
RE1-994
spellingShingle Ophthalmology
RE1-994
Davison JA
Potvin R
Refractive cylinder outcomes after calculating toric intraocular lens cylinder power using total corneal refractive power
description James A Davison,1 Richard Potvin21Wolfe Eye Clinic, Marshalltown, IA, USA; 2Science in Vision, Akron, NY, USAPurpose: To determine whether the total corneal refractive power (TCRP) value, which is based on measurement of both anterior and posterior corneal astigmatism, is effective for toric intraocular lens (IOL) calculation with AcrySof® Toric IOLsPatients and methods: A consecutive series of cataract surgery cases with AcrySof toric IOL implantation was studied retrospectively. The IOLMaster® was used for calculation of IOL sphere, the Pentacam® TCRP 3.0 mm apex/ring value was used as the keratometry input to the AcrySof Toric IOL Calculator and the VERION™ Digital Marker for surgical orientation. The keratometry readings from the VERION reference unit were recorded but not used in the actual calculation. Vector differences between expected and actual residual refractive cylinder were calculated and compared to simulated vector errors using the collected VERION keratometry data.Results: In total, 83 eyes of 56 patients were analyzed. Residual refractive cylinder was 0.25 D or lower in 58% of eyes and 0.5 D or lower in 80% of eyes. The TCRP-based calculation resulted in a statistically significantly lower vector error (P<0.01) and significantly more eyes with a vector error ≤0.5 D relative to the VERION-based calculation (P=0.02). The TCRP and VERION keratometry readings suggested a different IOL toric power in 53/83 eyes. In these 53 eyes the TCRP vector error was lower in 28 cases, the VERION error was lower in five cases, and the error was equal in 20 cases. When the anterior cornea had with-the-rule astigmatism, the VERION was more likely to suggest a higher toric power and when the anterior cornea had against-the-rule astigmatism, the VERION was less likely to suggest a higher toric power.Conclusion: Using the TCRP keratometry measurement in the AcrySof toric calculator may improve overall postoperative refractive results. Consideration of measured posterior corneal astigmatism, rather than a population-averaged value, appears advantageous.Keywords: toric IOL, posterior corneal astigmatism, astigmatism, keratometry, biometry, TCRP
format article
author Davison JA
Potvin R
author_facet Davison JA
Potvin R
author_sort Davison JA
title Refractive cylinder outcomes after calculating toric intraocular lens cylinder power using total corneal refractive power
title_short Refractive cylinder outcomes after calculating toric intraocular lens cylinder power using total corneal refractive power
title_full Refractive cylinder outcomes after calculating toric intraocular lens cylinder power using total corneal refractive power
title_fullStr Refractive cylinder outcomes after calculating toric intraocular lens cylinder power using total corneal refractive power
title_full_unstemmed Refractive cylinder outcomes after calculating toric intraocular lens cylinder power using total corneal refractive power
title_sort refractive cylinder outcomes after calculating toric intraocular lens cylinder power using total corneal refractive power
publisher Dove Medical Press
publishDate 2015
url https://doaj.org/article/0a55a64a92a64f36866bd348a2b3b71e
work_keys_str_mv AT davisonja refractivecylinderoutcomesaftercalculatingtoricintraocularlenscylinderpowerusingtotalcornealrefractivepower
AT potvinr refractivecylinderoutcomesaftercalculatingtoricintraocularlenscylinderpowerusingtotalcornealrefractivepower
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