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      A study regarding efficacy of various intraocular lens power calculation formulas in a subset of Indian myopic population

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          Abstract

          Efficacy of intraocular lens power calculation formulas in a subset of Indian myopic population. Retrospectively reviewed 43 patients who underwent phacoemulsification with high axial length (AL) (>24.5 mm, range 24.75-32.35 mm). The power of the implanted intraocular lens (IOL) was used to calculate the predicted post-operative refractive error by four formulas: Sanders-Retzlaff-Kraff (SRK II), SRK/T, Holladay 1, and Hoffer Q. The predictive accuracy of the formulas was analyzed by comparing the difference between the “actual” and “predicted” postoperative refractive errors. Repeated measures analysis of variance (ANOVA) tests were done to have pair-wise comparisons between the formulas and P < 0.05 was considered significant. A subcategory of axial length 24.5-26.5 mm was also tested. Holladay 1, Hoffer Q and SRK/T formulas showed a slight tendency toward resultant hyperopia, with mean error of +0.24 diopters (D), +0.58 D, and +0.92 D, respectively. The Holladay 1 formula provided the best predictive result overall.

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          Intraocular lens power calculation using the IOLMaster and various formulas in eyes with long axial length.

          Shu Chang, Jia Wang, Chao-su Hu (2008)
          To evaluate the predictability of intraocular lens (IOL) power calculations using the IOLMaster (Carl Zeiss) and different IOL power calculation formulas in eyes with a long axial length (AL). Department of Ophthalmology, Far Eastern Memorial Hospital, Taipei, Taiwan. This study included 68 eyes with an AL longer than 25.0 mm that had phacoemulsification with IOL implantation. Preoperative AL and keratometric index measurements were obtained with the IOLMaster (Group 1) or, respectively, with applanation ultrasound and automatic keratometry (Group 2). The power of the implanted IOL was used to calculate the predicted postoperative spherical equivalence (SE) by various formulas: SRK/T, SRK II, and Holladay 1 (Groups 1 and 2) and Haigis (Group 1). The predictive accuracy of the formula was analyzed by comparing the mean difference between the actual and predicted postoperative SE; that is, the mean absolute error (MAE). The mean AL was significantly longer in Group 1 than in Group 2 (P = .03). The MAEs calculated by the SRK/T, SRK II, and Holladay 1 formulas were comparable between the 2 groups (P>.05). The lowest MAE was obtained using the IOLMaster data in the Haigis formula (P<.05). Although AL measured by the IOLMaster was longer than that measured by ultrasound, use of optical or ultrasound biometry data in the SRK/T, SRK II, and Holladay 1 formulas resulted in similar accuracy of IOL power prediction in eyes with higher myopia. The IOL power calculated using the Haigis formula predicted the best refractive outcome in long eyes.
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            Accuracy of intraocular lens calculations using the IOLMaster in eyes with long axial length and a comparison of various formulas.

            Stacy Bang, Erica Edell, Qilu Yu … (2011)
            To evaluate the relationship between eyes with long axial length (AL) and postoperative refractive errors as predicted by various commonly used intraocular lens (IOL) formulas using the Zeiss IOLMaster (Carl Zeiss Meditec, Jena, Germany).
            Article 0 comments Cited 27 times – based on 0 reviews     Review now
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              Prevalence and risk factors for refractive errors in the South Indian adult population: The Andhra Pradesh Eye disease study

              Sannapaneni Krishnaiah, Marmamula Srinivas, Rohit C. Khanna … (2009)
              Aim: To report the prevalence, risk factors and associated population attributable risk percentage (PAR) for refractive errors in the South Indian adult population. Methods: A population-based cross-sectional epidemiologic study was conducted in the Indian state of Andhra Pradesh. A multistage cluster, systematic, stratified random sampling method was used to obtain participants (n = 10293) for this study. Results: The age-gender-area-adjusted prevalence rates in those ≥40 years of age were determined for myopia (spherical equivalent [SE] +0.5 D) 18.4% (95% CI: 17.1–19.7), astigmatism (cylinder 0.5 D) 13.0% (95% CI: 11.9–14.1). The prevalence of myopia, astigmatism, high-myopia, and anisometropia significantly increased with increasing age (all p < 0.0001). There was no gender difference in prevalence rates in any type of refractive error, though women had a significantly higher rate of hyperopia than men (p < 0.0001). Hyperopia was significantly higher among those with a higher educational level (odds ratio [OR] 2.49; 95% CI: 1.51–3.95) and significantly higher among the hypertensive group (OR 1.24; 95% CI: 1.03–1.49). The severity of lens nuclear opacity was positively associated with myopia and negatively associated with hyperopia. Conclusions: The prevalence of myopia in this adult Indian population is much higher than in similarly aged white populations. These results confirm the previously reported association between myopia, hyperopia, and nuclear opacity.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Indian J Ophthalmol
                Journal ID (iso-abbrev): Indian J Ophthalmol
                Journal ID (publisher-id): IJO
                Title: Indian Journal of Ophthalmology
                Publisher: Medknow Publications & Media Pvt Ltd (India )
                ISSN (Print): 0301-4738
                ISSN (Electronic): 1998-3689
                Publication date (Print): July 2014
                Volume: 62
                Issue: 7
                Pages: 826-828
                Affiliations
                [1]Sadguru Netra Chikitsalaya, Chitrakoot, Madhya Pradesh, India
                Author notes
                Correspondence to: Dr. Ashish Mitra, Sadguru Netra Chikitsalaya, Jankikund, Chitrakoot - 210 204, Madhya Pradesh, India. E-mail: ashishmitra14@ 123456gmail.com
                Article
                Publisher ID: IJO-62-826
                DOI: 10.4103/0301-4738.138634
                PMC ID: 4152660
                PubMed ID: 25116783
                SO-VID: 6b36fc16-03c8-4aff-a6cb-3c9ed32ce226
                Copyright © Copyright: © Indian Journal of Ophthalmology
                License:

                This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 25 December 2013
                Date accepted : 13 May 2014
                Categories
                Subject: Brief Communication

                ScienceOpen disciplines: Ophthalmology & Optometry
                Keywords: high myopia,intraocular lens power calculation,long axial length
                Data availability:
                ScienceOpen disciplines: Ophthalmology & Optometry
                Keywords: high myopia, intraocular lens power calculation, long axial length

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