Comparison of keratometric value in calculation of IOL (intraocular lens)power between manual keratometry and automated keratometry
Journal Title: Medpulse International Journal of Ophthalmology - Year 2018, Vol 8, Issue 3
Abstract
Background: Cataract is the opacity of the normal human crystalline lens of the eye. There are 1.3 Billion people are visually impaired. Among this, 188.5 million people are affected by mild visual impairement, 217 million people are moderate to severe million impairment and 36 million people are blind. The most common cause of blindness is a cataract. 50-80% of blindness in India is due to cataract. Aim of Study: To compare the Keratometric Value in Calculation of IOL (Intra Ocular Lens) Power with Manual Keratometry and Automated Keratometry. Methodology: A prospective study for evaluation of diagnostic technology was carried out from 100 eyes of 88 patients selected by non-probability purposive sampling technique who were admitted in Ophthalmic Ward for cataract surgery with IOL at Vinayaka Missions KirupanandaVariyar Medical College Hospital, Salem, TamilNadu, which is 560 bedded hospital having all inpatients and outpatient services.Among this 50 eyes were selected for manual keratometry from 49 patients and 50 eyes were selected for automated keratometry from 39 patients. Before surgery, the keratometry reading was taken for the patients to calculate the IOL power to be implanted by Manual Keratometry and Automated Keratometry. Forty-five days after the cataract surgery, refraction was done for maximum visual acuity correction in that operated eye and the power of the glasses was prescribed. Further, the difference in keratometry value between the manual keratometry and automated keratometry were analyzed. Results: Test of significance of Automated Keratometry and Manual Keratometry shows that the mean value of Automated Keratometry was 44.64 with the standard deviation of + 1.58, whereas the mean value of Manual Keratometry was 39.16 with the standard deviation of + 1.34, which reveals that the Automated Keratometry was more effective than the Manual Keratometry in calculation of IOL (Intra Ocular Lens) power for cataract surgery. Conclusion: The automated machine was found to be the most accurate, reliable, simple and easier to use. It also required less skill and less time to operate, that is significantly quicker than manual keratometry. Values are not influenced by the skill of operating person and therefore interobserver variations are eliminated.Patient cooperation is better due to the shorter duration and therefore auto keratometer is preferable.The only disadvantage is the cost of the machine.
Authors and Affiliations
R Rajeshkannan, M J Venkatesan, K Ezhilvendhan
Keywords
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- EP ID EP460742
- DOI 10.26611/1009833
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