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saraswati sivakumar, Rayirth sivakumar; ANGLE KAPPA IN MYOPES AND HYPEROPES AND ITS ROLE IN MULTIFOCAL LENS IMPLANTATIONS. Invest. Ophthalmol. Vis. Sci. 2019;60(9):516.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: Evaluation of angle kappa in individuals with hyperopia and myopia based on refraction and biometric analysis.
Methods: Angle kappa and spherical equivalent was measured in myopes and hyperopes using patient’s refraction and IOL master 500 (60 eyes were measured in the age group 40-90)
Results: Angle kappa was identified in 60 eyes on biometric analysis. Spherical equivalent was calculated. 25/35 myopes were noted to have an angle kappa with a negative value. 33/35 myopic eyes had an angle kappa of below 0.4 mm. 0.4 mm is the radius of a MFIOL. If the angle kappa size is greater then the radius then there is a risk of decentration of the lens. When observing the angle kappa in hyperopic individuals, 22/25 had an angle kappa with a positive value. 16/25 of the hyperopes had an angle kappa above 0.4mm which puts that percentage at greater risk for intraocular lens decentration.
Conclusion: Refraction may be an independent variable in determining angle kappa size.Individuals with who had a higher prescription typically had a large angle kappa and mild refractive errors typically had a smaller angle kappa size. There were outliers in both groups who didn’t follow the trend in data, but prescription is still an important factor to consider in refractive surgery.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.
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