Improving the Toric Intraocular Lens Calculation by Considering Posterior Corneal Astigmatism and Surgically-induced Corneal Astigmatism
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Purpose: To investigate the effect of surgically induced corneal astigmatism (SICA) and total corneal astigmatism (TCA) estimation on the anterior corneal astigmatism (ACA)-based toric intraocular lens (IOL) calculation. Methods: Data from preoperative and postoperative corneal astigmatism, postoperative visual acuities, and refractive outcomes were collected. The incision was superior in with the rule anterior corneal astigmatism (WTRA) eyes and temporal in against the rule anterior corneal astigmatism eyes. The following five methods of calculating the toric IOL were compared: (1) ACA only and estimated SICA; (2) ACA with a fixed posterior corneal astigmatism (PCA) and estimated SICA; (3) ACA with a fixed PCA value and actual SICA; (4) and (5) TCA derived from the regression equations of ACA and actual SICA. The residual astigmatism was simulated. The Alpins method was used to analyze the astigmatism. Results: Sixty eyes from 46 patients were enrolled. Thirty eyes had WTRA and the other thirty had against the rule anterior corneal astigmatism. The vector and arithmetic means of the difference vector decreased when the information regarding the actual SICA and PCA was added to the calculation (from 0.59 diopters [D] @ 87.5° to 0.15 D @ 48.5°, and from 0.95 ± 0.53 to 0.71 ± 0.63 D, respectively; p < 0.001). The mean difference vector across the whole sample was lowest using model 5. The correction index was significantly closest to 1.0 in the WTRA group. Conclusions: Researchers may improve the accuracy of post-implantation predictions by calculating toric IOL using exact SICA and TCA, with consideration of the PCA derived from the regression equation of ACA.
Abstract
Purpose: To investigate the effect of surgically induced corneal astigmatism (SICA) and total corneal astigmatism (TCA) estimation on the anterior corneal astigmatism (ACA)-based toric intraocular lens (IOL) calculation. Methods: Data from preoperative and postoperative corneal astigmatism, postoperative visual acuities, and refractive outcomes were collected. The incision was superior in with the rule anterior corneal astigmatism (WTRA) eyes and temporal in against the rule anterior corneal astigmatism eyes. The following five methods of calculating the toric IOL were compared: (1) ACA only and estimated SICA; (2) ACA with a fixed posterior corneal astigmatism (PCA) and estimated SICA; (3) ACA with a fixed PCA value and actual SICA; (4) and (5) TCA derived from the regression equations of ACA and actual SICA. The residual astigmatism was simulated. The Alpins method was used to analyze the astigmatism. Results: Sixty eyes from 46 patients were enrolled. Thirty eyes had WTRA and the other thirty had against the rule anterior corneal astigmatism. The vector and arithmetic means of the difference vector decreased when the information regarding the actual SICA and PCA was added to the calculation (from 0.59 diopters [D] @ 87.5° to 0.15 D @ 48.5°, and from 0.95 ± 0.53 to 0.71 ± 0.63 D, respectively; p < 0.001). The mean difference vector across the whole sample was lowest using model 5. The correction index was significantly closest to 1.0 in the WTRA group. Conclusions: Researchers may improve the accuracy of post-implantation predictions by calculating toric IOL using exact SICA and TCA, with consideration of the PCA derived from the regression equation of ACA.
참고문헌 (27)
- Pan CW, "Racial variations in the prevalence of refractive errors in the United States: the multi-ethnic study of atherosclerosis", Am J Ophthalmol, 155, pp.1129~1138 (2013)[DOI]
- Vitale S, "Prevalence of refractive error in the United States, 1999-2004", Arch Ophthalmol, 126, pp.1111~1119 (2008)[DOI]
- Lam DK, "Comparative evaluation of aspheric toric intraocular lens implantation and limbal relaxing incisions in eyes with cataracts and <TEX>${\leq}$<", TEX>3 dioptres of astigmatism, 2016, pp.100, 258~262
- Mingo-Botin D, "Comparison of toric intraocular lenses and peripheral corneal relaxing incisions to treat astigmatism during cataract surgery", J Cataract Refract Surg, 36, pp.1700~1708 (2010)[DOI]
- Nagpal R, "Toric intraocular lens versus monofocal intraocular lens implantation and photorefractive keratectomy: a randomized controlled trial", Am J Ophthalmol, 160, pp.479~486 (2015)[DOI]
- Titiyal JS, "Toric intraocular lens implantation versus astigmatic keratotomy to correct astigmatism during phacoemulsification", J Cataract Refract Surg, 40, pp.741~747 (2014)[DOI]
- Miyake T, "Distribution of posterior corneal astigmatism according to axis orientation of anterior corneal astigmatism", PLoS One, 10, pp.e0117194~ (2015)[DOI]
- Tonn B, "Anterior surface-based keratometry compared with Scheimpf lug tomography-based total corneal astigmatism", Invest Ophthalmol Vis Sci, 56, pp.291~298 (2014)
- Koch DD, "Correcting astigmatism with toric intraocular lenses: effect of posterior corneal astigmatism", J Cataract Refract Surg, 39, pp.1803~1809 (2013)[DOI]
- Zhang L, "Effect of posterior corneal astigmatism on refractive outcomes after toric intraocular lens implantation", J Cataract Refract Surg, 41, pp.84~89 (2015)[DOI]
- Koch DD, "Contribution of posterior corneal astigmatism to total corneal astigmatism", J Cataract Refract Surg, 38, pp.2080~2087 (2012)[DOI]
- Waltz KL, "Clinical outcomes of TECNIS toric intraocular lens implantation after cataract removal in patients with corneal astigmatism", Ophthalmology, 122, pp.39~47 (2015)[DOI]
- Abulafia A, "Prediction of refractive outcomes with toric intraocular lens implantation", J Cataract Refract Surg, 41, pp.936~944 (2015)[DOI]
- Eom Y, "Toric intraocular lens calculations using ratio of anterior to posterior corneal cylinder power", Am J Ophthalmol, 160, pp.717~724 (2015)[DOI]
- Holladay JT, "Analysis of aggregate surgically induced refractive change, prediction error, and intraocular astigmatism", J Cataract Refract Surg, 27, pp.61~79 (2001)[DOI]
- Alpins N, "Astigmatism analysis by the Alpins method", J Cataract Refract Surg, 27, pp.31~49 (2001)[DOI]
- Alpins NA, "Practical astigmatism analysis for refractive outcomes in cataract and refractive surgery", Surv Ophthalmol, 49, pp.109~122 (2004)[DOI]
- Ueno Y, "Corneal thickness profile and posterior corneal astigmatism in normal corneas", Ophthalmology, 122, pp.1072~1078 (2015)[DOI]
- Savini G, "An analysis of the factors influencing the residual refractive astigmatism after cataract surgery with toric intraocular lenses", Invest Ophthalmol Vis Sci, 56, pp.827~835 (2015)[DOI]
- Reitblat O, "Effect of posterior corneal astigmatism on power calculation and alignment of toric intraocular lenses: comparison of methodologies", J Cataract Refract Surg, 42, pp.217~225 (2016)[DOI]
- Ho JD, "Effects of aging on anterior and posterior corneal astigmatism", Cornea, 29, pp.632~637 (2010)[DOI]
- Tejedor J, "Astigmatic change induced by 2.8-mm corneal incisions for cataract surgery", Invest Ophthalmol Vis Sci, 50, pp.989~994 (2009)[DOI]
- Rho CR, "Effects of steep meridian incision on corneal astigmatism in phacoemulsification cataract surgery", J Cataract Refract Surg, 38, pp.666~671 (2012)[DOI]
- Cillino S, "Temporal versus superior approach phacoemulsification: short-term postoperative astigmatism", J Cataract Refract Surg, 23, pp.267~271 (1997)[DOI]
- Sheppard AL, "Clinical outcomes after implantation of a new hydrophobic acrylic toric IOL during routine cataract surgery", J Cataract Refract Surg, 39, pp.41~47 (2013)[DOI]
- Ferreira TB, "Comparison of the visual outcomes and OPD-scan results of AMO Tecnis toric and Alcon Acrysof IQ toric intraocular lenses", J Refract Surg, 28, pp.551~555 (2012)[DOI]
- Hirnschall N, "Rotational stability of a single-piece toric acrylic intraocular lens: a pilot study", Am J Ophthalmol, 157, pp.405~411 (2014)[DOI]