Tags

Type your tag names separated by a space and hit enter

Comparison of Newer Intraocular Lens Power Calculation Methods for Eyes after Corneal Refractive Surgery.
Ophthalmology 2015; 122(12):2443-9O

Abstract

PURPOSE

To compare the newer formulae, the optical coherence tomography (OCT)-based intraocular lens (IOL) power formula (OCT formula) and the Barrett True-K formula (True-K), with the methods on the American Society of Cataract and Refractive Surgery (ASCRS) calculator in eyes with previous myopic LASIK/photorefractive keratectomy (PRK).

DESIGN

Prospective case series.

PARTICIPANTS

A total of 104 eyes of 80 patients who had previous myopic LASIK/PRK and subsequent cataract surgery and IOL implantation.

METHODS

By using the actual refraction after cataract surgery as target refraction, predicted IOL power for each method was calculated. The IOL prediction error (PE) was obtained by subtracting the predicted IOL power from the power of the IOL implanted.

MAIN OUTCOME MEASURES

Arithmetic IOL PEs, variances of mean arithmetic IOL PE, median refractive PE, and percent of eyes within 0.5 diopters (D) and 1.0 D of refractive PE.

RESULTS

Optical coherence tomography produced smaller variance of IOL PE than did Wang-Koch-Maloney (WKM) and Shammas (P < 0.05). With the OCT, True-K No History, WKM, Shammas, Haigis-L, and Average of these 5 formulas, the median refractive PEs were 0.35 D, 0.42 D, 0.51 D, 0.48 D, 0.39 D, and 0.35 D, respectively, the percentage of eyes within 0.5 D of refractive PE were 68.3%, 58.7%, 50.0%, 52.9%, 55.8%, and 67.3%, respectively, and the percentage of eyes within 1.0 D of refractive PE were 92.3%, 90.4%, 86.9%, 88.5%, 90.4%, and 94.2%, respectively. The OCT formula had smaller refractive PE compared with the WKM and Shammas, and the Average approach produced significantly smaller refractive PE than all methods except OCT (all P < 0.05).

CONCLUSIONS

The OCT and True-K No History are promising formulas. The ASCRS IOL calculator has been updated to include the OCT and Barrett True K formulas.

TRIAL REGISTRATION

Intraocular Lens Power Calculation After Laser Refractive Surgery Based on Optical Coherence Tomography (OCT IOL); Identifier: NCT00532051; www.ClinicalTrials.gov.

Authors+Show Affiliations

Cullen Eye Institute, Baylor College of Medicine, Houston, Texas.Casey Eye Institute, Oregon Health & Science University, Portland, Oregon.Casey Eye Institute, Oregon Health & Science University, Portland, Oregon.Cullen Eye Institute, Baylor College of Medicine, Houston, Texas.Cullen Eye Institute, Baylor College of Medicine, Houston, Texas. Electronic address: dkoch@bcm.edu.

Pub Type(s)

Comparative Study
Journal Article
Multicenter Study
Observational Study
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26459996

Citation

Wang, Li, et al. "Comparison of Newer Intraocular Lens Power Calculation Methods for Eyes After Corneal Refractive Surgery." Ophthalmology, vol. 122, no. 12, 2015, pp. 2443-9.
Wang L, Tang M, Huang D, et al. Comparison of Newer Intraocular Lens Power Calculation Methods for Eyes after Corneal Refractive Surgery. Ophthalmology. 2015;122(12):2443-9.
Wang, L., Tang, M., Huang, D., Weikert, M. P., & Koch, D. D. (2015). Comparison of Newer Intraocular Lens Power Calculation Methods for Eyes after Corneal Refractive Surgery. Ophthalmology, 122(12), pp. 2443-9. doi:10.1016/j.ophtha.2015.08.037.
Wang L, et al. Comparison of Newer Intraocular Lens Power Calculation Methods for Eyes After Corneal Refractive Surgery. Ophthalmology. 2015;122(12):2443-9. PubMed PMID: 26459996.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Comparison of Newer Intraocular Lens Power Calculation Methods for Eyes after Corneal Refractive Surgery. AU - Wang,Li, AU - Tang,Maolong, AU - Huang,David, AU - Weikert,Mitchell P, AU - Koch,Douglas D, Y1 - 2015/10/14/ PY - 2015/06/04/received PY - 2015/08/24/revised PY - 2015/08/25/accepted PY - 2015/10/14/entrez PY - 2015/10/16/pubmed PY - 2016/3/18/medline SP - 2443 EP - 9 JF - Ophthalmology JO - Ophthalmology VL - 122 IS - 12 N2 - PURPOSE: To compare the newer formulae, the optical coherence tomography (OCT)-based intraocular lens (IOL) power formula (OCT formula) and the Barrett True-K formula (True-K), with the methods on the American Society of Cataract and Refractive Surgery (ASCRS) calculator in eyes with previous myopic LASIK/photorefractive keratectomy (PRK). DESIGN: Prospective case series. PARTICIPANTS: A total of 104 eyes of 80 patients who had previous myopic LASIK/PRK and subsequent cataract surgery and IOL implantation. METHODS: By using the actual refraction after cataract surgery as target refraction, predicted IOL power for each method was calculated. The IOL prediction error (PE) was obtained by subtracting the predicted IOL power from the power of the IOL implanted. MAIN OUTCOME MEASURES: Arithmetic IOL PEs, variances of mean arithmetic IOL PE, median refractive PE, and percent of eyes within 0.5 diopters (D) and 1.0 D of refractive PE. RESULTS: Optical coherence tomography produced smaller variance of IOL PE than did Wang-Koch-Maloney (WKM) and Shammas (P < 0.05). With the OCT, True-K No History, WKM, Shammas, Haigis-L, and Average of these 5 formulas, the median refractive PEs were 0.35 D, 0.42 D, 0.51 D, 0.48 D, 0.39 D, and 0.35 D, respectively, the percentage of eyes within 0.5 D of refractive PE were 68.3%, 58.7%, 50.0%, 52.9%, 55.8%, and 67.3%, respectively, and the percentage of eyes within 1.0 D of refractive PE were 92.3%, 90.4%, 86.9%, 88.5%, 90.4%, and 94.2%, respectively. The OCT formula had smaller refractive PE compared with the WKM and Shammas, and the Average approach produced significantly smaller refractive PE than all methods except OCT (all P < 0.05). CONCLUSIONS: The OCT and True-K No History are promising formulas. The ASCRS IOL calculator has been updated to include the OCT and Barrett True K formulas. TRIAL REGISTRATION: Intraocular Lens Power Calculation After Laser Refractive Surgery Based on Optical Coherence Tomography (OCT IOL); Identifier: NCT00532051; www.ClinicalTrials.gov. SN - 1549-4713 UR - https://www.unboundmedicine.com/medline/citation/26459996/Comparison_of_Newer_Intraocular_Lens_Power_Calculation_Methods_for_Eyes_after_Corneal_Refractive_Surgery_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0161-6420(15)00893-3 DB - PRIME DP - Unbound Medicine ER -