==== Front Indian J OphthalmolIndian J OphthalmolIJOIndian Journal of Ophthalmology0301-47381998-3689Medknow Publications & Media Pvt Ltd India IJO-66-122710.4103/ijo.IJO_634_18Letters to the EditorPlanning a new intraocular lens library in the Indian scenario Saluja Gunjan Takkar Brijesh 1Agarwal Esha Sharma Bhavana 1Khokhar Sudarshan Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India1 Department of Ophthalmology, All India Institute of Medical Sciences, Bhopal, Madhya Pradesh, India Correspondence to: Dr. Brijesh Takkar, Department of Ophthalmology, All India Institute of Medical Sciences, Saket Nagar, Bhopal - 462 020, Madhya Pradesh, India. E-mail: britak.aiims@gmail.com8 2018 66 8 1227 1228 Copyright: © 2018 Indian Journal of Ophthalmology2018This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms. ==== Body Sir, Cataract is the most common cause of avoidable blindness in India.[123] Implantation of an intraocular lens (IOL) has become a standard care and the National Health-care Policy of India has set the norms of 95% surgeries to have IOL implantation by 2020.[4] It is essential for the new institutes aiming for high-volume surgeries to have an IOL library.[5] We evaluated the ocular biometry of patients undergoing cataract surgery retrospectively to identify the requisite IOL powers as no such Indian database is available. Patients of age more than 40 years with no other ocular history were included. Axial length (AL) in millimeters and keratometry (K) in diopters were measured using a single optical biometer. IOL power was calculated with the biometer using modified SRK-2 formula for the most minimal myopic refractive error possible. The A-constant was set at 118.7 for these calculations, while surgeon factor was set as ± 0.5 D. Totally 850 eyes were included in the analysis. Mean age of the patients was 60.25 ± 9.10 years (range:- 40–83 years), while 606 were males (71%). Mean AL and keratometry were 23.23 ± 1.18 mm and 44.11 ± 1.86 D, respectively. The mean IOL power was measured as 21.08 ± 7.36 D (3–31). The distribution of the IOL powers is presented in Fig. 1. Our results show that the most commonly required IOL powers (90% cases) in the Indian setting are in the range of 18 D–24.5 D. Further, nearly two-thirds of them range between 19 D and 23 D. It should be noted here the IOL powers in this study have been calculated using a single A-constant, and minor variations can thus be expected. The results of our study will be helpful toward setting up of IOL libraries in new Indian facilities. Figure 1 Histogram depicting percentages of different intraocular lens powers required in Indian patients undergoing cataract surgery Financial support and sponsorship Nil. Conflicts of interest There are no conflicts of interest. ==== Refs 1 Neena J Rachel J Praveen V Murthy GV Rapid Assessment of Avoidable Blindness India Study Group Rapid assessment of avoidable blindness in India PLoS One 2008 3 e2867 18682738 2 Murthy GV Gupta SK Bachani D Jose R John N Current estimates of blindness in India Br J Ophthalmol 2005 89 257 60 15722298 3 Dandona L Dandona R John RK Estimation of blindness in India from 2000 through 2020: Implications for the blindness control policy Natl Med J India 2001 14 327 34 11804362 4 Vemparala R Gupta P National Programme for Control of Blindness (NPCB) in the 12th five-year plan: An overview Delhi J Ophthalmol 2017 27 290 2 5 Foster A Cataract and “Vision 2020-the right to sight” initiative Br J Ophthalmol 2001 85 635 7 11371475