Gr upSM Evaluation of the Refractive Error in Pseudophakic , Aphakic and Phakic Dogs using Streak Retinoscopy

This study evaluated the refractive error in dogs with intraocular lens (IOL) implants, aphakic dogs and healthy controls. A population of 49 dogs (92 retinoscopies) was divided in 3 groups pseudophakic (n=36 eyes), aphakic (n=4 eyes) and phakic healthy control (n=52 eyes). Streak retinoscopy was performed by horizontal and vertical refraction. Mean refractive state was: pseudophakic group +3.74 ±5.45D (-3.5; +21.0D); aphakic group +16.94 ±1.39D (+15.5; +18.25D) and phakic group -0.03 ±1.64D (-5.0; +4.0D). On the pseudophakic animals 72.2% were hyperopic, 13.9% were myopic and emmetropic. Astigmatism was diagnosed in 3 eyes. Anisometropia was observed in 10 patients (1; 20.5D) and antimetropia in 2. Correlation between refractive values/optic axial length suggested a tendency towards emmetropia in animals with higher ocular diameter (P= 0.0845; rho= -0.3). On the phakic group 44% were emmetropic, 30% hyperopic and 26% myopic. Low hyperopia predominated on hyperopic eyes (66.7%). No cases of astigmatism, anisometropia or antimetropia were found on the phakic group. All aphakic patients presented with high hyperopia. Francisco Vieira2 and Esmeralda Costa Delgado1* 1CIISA Centre for interdisciplinar Research in Animal Health, Faculty of Veterinary medicine, University of Lisbon 2Faculty of Veterinary medicine, University of Lisbon *Corresponding author: Esmeralda Costa Delgado, DVM, PhD, CIISA Centre for interdisciplinar Research in Animal Health, Faculty of Veterinary Medicine, University of Lisbon, Email: esmeralda@fmv.ulisboa.pt Published Date: May 31, 2018

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