Editorial Type:
Physiology

Refractive state of aphakic and pseudophakic eyes of dogs

M. G. Davidson From the Department of Companion Animal and Special Species Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (Davidson, Nasisse, Hellkamp, Olivero, Brinkmann), the Department of Surgical Sciences, College of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (Murphy), and The Animal Eye Clinic, Menlo Park, CA 94025 (Campbell).

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C. J. Murphy From the Department of Companion Animal and Special Species Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (Davidson, Nasisse, Hellkamp, Olivero, Brinkmann), the Department of Surgical Sciences, College of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (Murphy), and The Animal Eye Clinic, Menlo Park, CA 94025 (Campbell).

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M. P. Nasisse From the Department of Companion Animal and Special Species Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (Davidson, Nasisse, Hellkamp, Olivero, Brinkmann), the Department of Surgical Sciences, College of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (Murphy), and The Animal Eye Clinic, Menlo Park, CA 94025 (Campbell).

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A. S. Hellkamp From the Department of Companion Animal and Special Species Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (Davidson, Nasisse, Hellkamp, Olivero, Brinkmann), the Department of Surgical Sciences, College of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (Murphy), and The Animal Eye Clinic, Menlo Park, CA 94025 (Campbell).

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D. K. Olivero From the Department of Companion Animal and Special Species Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (Davidson, Nasisse, Hellkamp, Olivero, Brinkmann), the Department of Surgical Sciences, College of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (Murphy), and The Animal Eye Clinic, Menlo Park, CA 94025 (Campbell).

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M. C. Brinkmann From the Department of Companion Animal and Special Species Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (Davidson, Nasisse, Hellkamp, Olivero, Brinkmann), the Department of Surgical Sciences, College of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (Murphy), and The Animal Eye Clinic, Menlo Park, CA 94025 (Campbell).

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L. H. Campbell From the Department of Companion Animal and Special Species Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (Davidson, Nasisse, Hellkamp, Olivero, Brinkmann), the Department of Surgical Sciences, College of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (Murphy), and The Animal Eye Clinic, Menlo Park, CA 94025 (Campbell).

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SUMMARY

Streak retinoscopy was performed by 5 ophthalmologists on 256 eyes (191 dogs) to determine their postoperative refractive state after cataract extraction. Aphakic and pseudophakic eyes that had been implanted with 1 of 5 intraocular lenses (iol) with dioptric powers ranging from + 14.5 to + 38 diopters (D) were studied. By use of ANOVA, breed and body type of dog and individual performing refraction were found to have no detectable effect on final refractive state. Mean refractive state of aphakic eyes was +14.4 ± 2.10 D. Mean refractive state for different iol powers was as follows: + 14.5 D iol = + 11.54 ± 1.18 D (n = 13); +30 D iol = + 5.15 ± 1.18 D (n = 105); + 34.0 D iol = +3.5 D (n = 1); +36 D iol = +2.34 ± 0.73 D 9 (n = 61); and +38 D iol = + 1.41 ± 0.56 D (n = 28). Residual hyperopia ranged from +0.5 D to +2.5 D with +38 D iol, and no eyes were myopic (overcorrected) by use of any of the iol studied. Linear regression analysis of refractive state on iol power for all dogs predicted that dioptric strength of +41.53 D was necessary to best approximate emmetropia for the population as a whole. Body type of the dog had only slight effect (< 1.0 D) on predicted optimal iol power. Further linear regression analysis of the 7 breeds studied predicted variations from +39.62 to +43.14 D in iol powers necessary to approximate emmetropia. Results of the study support the routine use of canine iol with dioptric strength of approximately + 41.5 D in circumstances in which preoperative biometry and keratometry are not practical. The findings further suggest that, for the specific population of dogs studied, most of the dogs could be corrected to near emmetropia by use of a small range of iol dioptric strengths, irrespective of body type or breed.

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Cover American Journal of Veterinary Research
American Journal of Veterinary Research
Issue:
01 Jan 1993
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