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Original article
Brijesh A Patil1,*, Anupama C Shettgar1,€,Nanditha Arekal1,¥
Affiliation:
1,*Associate professor,1,€Assistant Professor,1,¥ 2nd year Post graduate, Department of Ophthalmology, SNMC, Bagalkot, India
The name of the department(s) and institution(s) to which the work should be attributed:
Department of Ophthalmology, SNMC, Bagalkot, India
Address reprint requests to
* Dr Nanditha A M.
Post graduate, Department of Ophthalmology, SNMC, Bagalkot, India
Article citation: Patil, B.A.,Shettgar A.C.,Nanditha, A.M. A clinical study to determine the efficacy of ultrasonic biometry and SRK II formula in calculation of IOL power. J Pharm Biomed Sci. 2015;05(09):719-724. Available at www.jpbms.info
ABSTRACT: The aim of the study was to estimate the post-operative refraction with IOL implanted by using A-scan biometry and SRK II formula, to determine the difference between estimated and actual post-operative refractive error,to determine the range of deviation of post-operative refractive error from expected refraction encountered by using this method.
Methods: The study was carried out in 100 patients admitted in HSK hospital, Bagalkot undergoing extracapsular cataract extraction with posterior chamber intraocular lens implantation. IOL power was calculated using SRK II formula. The aim was to make the patient slightly myopic. The expected post-operative refraction was subtracted from the spherical correction for distance. This gives deviation of post-operative refraction from expected value. The results thus obtained were tabulated in the proforma and master table and analysed.
Results: Using A scan biometry and SRK II formula the accuracy of IOL prediction was as follows-76 percent patients had errors within ±1D, Ninety five within± 2D and ninety eight within ±3D.
Conclusion: A Scan biometry with SRK II formula is recommended as an accurate method of IOL power calculation for desired postoperative refraction.
KEYWORDS: a-scan biometry; intraocular lens power calculation; SRK II formula.
REFERENCES
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3.Carstocea B, Stefaniu I, Stephan C, Zeuba M. The correlation between biometric determination of pseudophakic power and post-operative refraction. Ophthalmologia 1996;40(3):219-22.
4.Mohinder S, Dang, Sunder PP. SRK II formula in calculation of intraocular lens power. Br J Ophthalmol 1989;73:823-26.
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Source of funding: None
Competing interest / Conflict of interest: The author(s) have no competing interests for financial support, publication of this research, patents and royalties through this collaborative research. All authors were equally involved in discussed research work. There is no financial conflict with the subject matter discussed in the manuscript.
Disclaimer: Any views expressed in this paper are those of the authors and do not reflect the official policy or position of the Department of Defense.
Majority of the information gathered are from media sources which don’t reflect the author’s own opinion.
Copyright © 2015 Patil B.A.,Shettgar A.C.,Nanditha A.M. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.