May 2004
Volume 45, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2004
Electroretinographic and demographic findings in dogs presented for cataract surgery (1998–2003).
Author Affiliations & Notes
  • A.J. Gemensky–Metzler
    Comparative Ophthalmology, The Ohio State University Coll of Vet Med, Columbus, OH
  • D.A. Wilkie
    Comparative Ophthalmology, The Ohio State University Coll of Vet Med, Columbus, OH
  • C.M. Colitz
    Comparative Ophthalmology, The Ohio State University Coll of Vet Med, Columbus, OH
  • I.D. Bras
    Comparative Ophthalmology, The Ohio State University Coll of Vet Med, Columbus, OH
  • R.J. Morreale
    Comparative Ophthalmology, The Ohio State University Coll of Vet Med, Columbus, OH
  • K.A. Norris
    Comparative Ophthalmology, The Ohio State University Coll of Vet Med, Columbus, OH
  • R. Elliott
    The Ohio State University, Columbus, OH
  • Footnotes
    Commercial Relationships  A.J. Gemensky–Metzler, None; D.A. Wilkie, None; C.M. Colitz, None; I.D. Bras, None; R.J. Morreale, None; K.A. Norris, None; R. Elliott, None.
  • Footnotes
    Support  none
Investigative Ophthalmology & Visual Science May 2004, Vol.45, 437. doi:
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      A.J. Gemensky–Metzler, D.A. Wilkie, C.M. Colitz, I.D. Bras, R.J. Morreale, K.A. Norris, R. Elliott; Electroretinographic and demographic findings in dogs presented for cataract surgery (1998–2003). . Invest. Ophthalmol. Vis. Sci. 2004;45(13):437.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Abstract: : Purpose: To establish normal electroretinogram (ERG) values for dogs with cataracts undergoing electroretinography and determine factors that influence ERG values. Methods: An ERG was performed on 281 dogs with cataracts. Standard photopic and scoptic ERGs were performed under general anesthesia. Mean photopic and scotopic values were statistically compared between breeds, age groups and diabetic and non–diabetic dogs. The mean values for OD and OS for each group were averaged together when not significantly different. Results: An ERG was recorded for 50 breeds. The average age was 7.7 years (range 0.75–18 years) and the mean photopic values were 19.5 microvolts (uv) OS, 18.1uv OD and mean scotopic values were 104.3uv OS and 98.72uv OD. Diabetes mellitus (DM) was the cause of cataracts in 108 dogs (38.4%) and 173 dogs were not diabetic. The average age, mean photopic and scotopic values for diabetic and non–diabetic dogs respectively were 8.5 years, 18.1uv, 104.2uv and 8.1 years, 19.3uv, 97.4uv. The most common breeds presented for cataract surgery, number evaluated, number with DM, average age, and mean photopic and scotopic values were as follows: Mixed breed (54; 23; 9.2 yr; 18.6, 109), miniature schnauzer (26; 16; 7.3 yr; 17.0, 76.0), Labrador retriever (26; 12; 6 yr; 21.5, 126.8), miniature and toy poodle (25; 6; 9.2 yr; 15.1, 66.6), Bichon Frise (14; 2; 5.3 yr; 17.8, 85.4), Yorkshire terrier (12; 6; 8.9 yr; 14.7, 67.2), Siberian Husky (10; 2; 4.1 yr; 34.2, 195.0), Lhasa Apso (9; 5; 10 yr; 20.3, 88.2), Boston terrier (6; 0; 8.5 yr; 26.9, 127.7), Golden retriever (6; 0; 6.8 yr; 17.8, 75.6), Shih Tzu (6; 1; 9.5 yr; 19.7, 130.0), Cairn terrier (5; 5; 9.4 yr; 18.7, 145.8), miniature pinscher (5; 4; 7.8 yr; 13.6, 49.0). Conclusions:ERGs were not significantly different between diabetic and non–diabetic dogs. Diabetic cataracts were most common in the mixed breed, miniature Schnauzer, Cairn and Yorkshire terriers, miniature pinscher and Labrador retriever. ERG values were significantly highest in the Siberian Husky and dogs 3 years of age and younger. Increasing age was associated with a decrease in ERG values.

Keywords: electroretinography: clinical • diabetes • cataract 
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