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Home / Equine Research Bank / Vet Ophthalmol / Ocular abnormalities in the Icelandic horse with a focus on ...
Veterinary ophthalmology2021; 25(3); 194-208; doi: 10.1111/vop.12961

Ocular abnormalities in the Icelandic horse with a focus on equine recurrent uveitis: 112 Icelandic horses living in Denmark and 26 Icelandic horses living in the United States.

Abstract: To describe the most common ocular abnormalities in the Icelandic horse with focus on equine recurrent uveitis (ERU) and association between ocular abnormalities and summer eczema and coat colors. Methods: A descriptive cross-sectional study. A complete physical and ophthalmic examination as well as measurement of serum titers for Leptospira serovariants was performed on Icelandic horses from Denmark (DK) and the United States (USA). Results: One hundred and twelve Icelandic horses living in DK and 26 Icelandic horses living in the United States were included in this study (total of 138 horses, 274 eyes). The three most common ocular abnormalities were follicular conjunctivitis (55.8%, 153/274 eyes), cataracts (27.4%, 75/274 eyes), and multifocal chorioretinopathy ("bullet holes"; 19%, 52/274 eyes). The prevalence for ERU among Icelandic horses aged "eight years and older" was 8% (6/75 horses). The "insidious ERU" type was found in 83% of the ERU cohort (5/6 horses), while "classic ERU" was found in 17% (1/6 horses). A correlation between ERU and cataracts was found in the population (p < .01). Leptospiral serology results were not associated with ERU in either DK or US-Icelandic horses (p = 1.00, p = 1.00, respectively). ERU was not associated with summer eczema (p = .49), and no coat colors were associated with the ocular abnormalities found in the Icelandic horse (all p-values > .05). Conclusions: Follicular conjunctivitis, cataracts, and multifocal chorioretinopathy were the three most common ocular abnormalities findings. Icelandic horses who were 8 years or older had an 8% prevalence for ERU. Summer eczema and coat color were not associated with evidence of ERU or other ocular abnormalities.
© 2021 American College of Veterinary Ophthalmologists.
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Publication Date: 2021-12-10 PubMed ID: 34890112DOI: 10.1111/vop.12961Google Scholar: Lookup
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Summary

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The research conducted aimed to identify the most common eye abnormalities in Icelandic horses, with a particular focus on equine recurrent uveitis (ERU). The study found that the most common ocular issues Icelandic horses face are follicular conjunctivitis, cataracts, and multifocal chorioretinopathy, with a small proportion of the horses over 8 years diagnosed with ERU.

Methodology

  • The research used a descriptive cross-sectional study design to explore the prevalence of ocular abnormalities in Icelandic horses.
  • Both physical and ophthalmic examinations were conducted, along with measuring serum titers for Leptospira serovariants.
  • The sample of horses studied came from two countries – Denmark and the United States. The total sample size was 138 horses; 112 from Denmark and 26 from the United States.

Findings

  • The research found three common ocular abnormalities prevalent in the horse sample: follicular conjunctivitis (55.8% of eyes tested), cataracts (27.4% of eyes tested), and multifocal chorioretinopathy (19% of the eyes tested).
  • ERU was found in 8% of the horses aged 8 years and older.
  • Of the ERU cohort, 83% were diagnosed with “insidious ERU” while 17% were diagnosed with the “classic ERU.”
  • A statistical correlation was found between the presence of ERU and cataracts (p < .01), suggesting a link between the two conditions.

Leptospiral Serology and Other Factors

  • Despite conducting Leptospiral serology tests, no associations were found between ERU and the results in either Danish or American Icelandic horses.
  • Furthremore, the study also showed that ERU was not associated with summer eczema, a common skin condition in horses.
  • No association was found between coat colors of the horses and the presence of ocular abnormalities.

Conclusion

  • The key findings from the study highlighted follicular conjunctivitis, cataracts, and multifocal chorioretinopathy as the most common ocular abnormalities in Icelandic horses.
  • The prevalence of ERU in horses aged 8 years or older was 8%.
  • Interestingly, the study did not find any relationship between ERU or other ocular abnormalities and factors like coat color and summer eczema.

Cite This Article

APA
Henriksen ML, Dwyer AE, Krarup Nielsen R, Bäcklund S, Dahlmann Christensen N, Holberg Pihl T. (2021). Ocular abnormalities in the Icelandic horse with a focus on equine recurrent uveitis: 112 Icelandic horses living in Denmark and 26 Icelandic horses living in the United States. Vet Ophthalmol, 25(3), 194-208. https://doi.org/10.1111/vop.12961

Publication

Veterinary ophthalmology
ISSN: 1463-5224
NlmUniqueID: 100887377
Country: England
Language: English
Volume: 25
Issue: 3
Pages: 194-208

Researcher Affiliations

Henriksen, Michala de Linde
  • Comparative Ophthalmology, Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado, USA.
Dwyer, Ann E
  • Genesee Valley Equine Clinic, LLC, Scottsville, New York, USA.
Krarup Nielsen, Rikke
  • Medicine and Surgery, Department of Veterinary Clinical Sciences, Faculty of Health Sciences, University of Copenhagen, Taastrup, Denmark.
Bäcklund, Sofia
  • Medicine and Surgery, Department of Veterinary Clinical Sciences, Faculty of Health Sciences, University of Copenhagen, Taastrup, Denmark.
Dahlmann Christensen, Nanna
  • Medicine and Surgery, Department of Veterinary Clinical Sciences, Faculty of Health Sciences, University of Copenhagen, Taastrup, Denmark.
Holberg Pihl, Tina
  • Medicine and Surgery, Department of Veterinary Clinical Sciences, Faculty of Health Sciences, University of Copenhagen, Taastrup, Denmark.

MeSH Terms

  • Animals
  • Cataract / epidemiology
  • Cataract / veterinary
  • Chronic Disease
  • Conjunctivitis / veterinary
  • Cross-Sectional Studies
  • Denmark / epidemiology
  • Eczema / veterinary
  • Horse Diseases / diagnosis
  • Horses
  • Humans
  • Iceland / epidemiology
  • Leptospira
  • Leptospirosis / veterinary
  • Recurrence
  • United States
  • Uveitis / diagnosis
  • Uveitis / epidemiology
  • Uveitis / veterinary

Grant Funding

  • 110949 / KUSTOS af 1881 Foundation, Denmark

References

This article includes 34 references
  1. Van Keulen L, Oosternus V. Chapter 1: From an island on the artic circle to the whole western world.. In: Van Keulen L, Oosternus V, eds. The Complete Guide to the Icelandic Horse, 1st ed. Islenski Hesturinn Foundation; 2017:5-18.
  2. Van Keulen L, Oosternus V. Chapter 26: The many colors of the Icelandic horse.. In: Van Keulen L, Oosternus V, eds. The Complete Guide to the Icelandic Horse, 1st ed. Islenski Hesturinn Foundation; 2017:349-367.
  3. Andersson LS, Axelsson J, Dubielzig RR. Multiple congenital ocular anomalies in Icelandic horses.. BMC Vet Res 2011;7:1-5.
  4. Grahn BH, Pinard C, Archer S. Congenital ocular anomalies in purebred and crossbred Rocky and Kentucky Mountain horses in Canada.. Can Vet J 2008;49:675-681.
  5. La Croix N. Equine recurrent uveitis.. Online client information from 2018. (06.22.2021) https://vmcli.com/equine-recurrent-uveitis/.
  6. McMullen RJ, Fischer BM. Medical and surgical management of equine recurrent uveitis.. Vet Clin Equine 2017;33:465-481.
  7. Plummer CR. Chapter 29: Equine ophthalmology.. In: Gelatt KN, ed. Veterinary Ophthalmology, 6th ed. Wiley Blackwell; 2021:1841-1982.
  8. Cross RSN. Equine periodic ophthalmia.. Vet Rec 1966;78:8-13.
  9. Gilger BC, Hollingsworth SR. Chapter 8: Diseases of the uvea, uveitis, and recurrent uveitis.. In: Gilger BC, ed. Equine Ophthalmology, 3rd ed. Wiley Blackwell; 2017:369-415.
  10. Allbaugh RA. Equine recurrent uveitis: a review of clinical assessment and management.. Equine Vet Educ 2017;29:279-288.
    doi: 10.1111/eve.12548google scholar: lookup
  11. Fritz KL, Kaese HJ, Valberg SJ. Genetic risk factors for insidious equine recurrent uveitis in Appaloosa horses.. Anim Genet 2014;45:392-399.
  12. Kulbrock M, Lehner S, Metzger J. A genome-wide association study identifies risk loci to equine recurrent uveitis in German warmblood horses.. PLoS One 2013;8:e71619.
  13. Barbet J. Culicoides hypersensitivity.. In: Mills L, ed. Current Therapy in Equine Medicine. WB Saunders; 1992:693-696.
  14. Halldorsdottir S, Larsen HJ. Intradermal challenge of Icelandic horses with extracts of four species of the genus Culicoides.. Res Vet Sci 1989;47(3):283-287.
  15. van Grevenhof EM, Ducro B, Heuven HCM, Bijma P. Identification of environmental factors affecting the prevalence of insect bite hypersensitivity in Shetland ponies and Friesian horses in the Netherlands.. Equine Vet J 2007;39:69-73.
  16. Van Keulen L, Oosternus V. Chapter 20: Health and common problems.. In: Van Keulen L, Oosternus V, eds. The Complete Guide to the Icelandic Horse, 1st ed. Islenski Hesturinn Foundation; 2017: 251-274.
  17. Bjornsdottir S, Sigvaldadottir J, Brostrom H. Summer eczema in exported Icelandic horses: influence of environmental and genetic factors.. Acta Vet Scand 2006;48:1-4.
  18. Worldfengur homepage (06.22.2021): https://www.feif.org/breeding-dept/worldfengur/
  19. Stoppini R, Gilger BC. Chapter 1: Equine ocular examination basic techniques.. In: Gilger BC, ed. Equine Ophthalmology, 3rd ed. Wiley Blackwell; 2017:1-71.
  20. Kimura S, Thygeson P, Hogan M. Signs and symptoms of uveitis. 1. Anterior uveitis.. Am J Ophthalmol 1959;47:155-170.
  21. Sandmeyer LS, Kingsley NB, Wlader C. Risk factors for equine recurrent uveitis in a population of Appaloosa horses in western Canada.. Vet Ophthalmol 2020;23:515-525.
  22. Hartley C, Hendrix DVH. Chapter 18: Diseases and surgery of the canine conjunctiva and nictitating membrane.. In: Gelatt KN, ed. Veterinary Ophthalmology, 6th ed. Wiley Blackwell; 2021:1045-1081.
  23. Nell B, Gelbmann W, Mostl K. Occurrence of bacteria, fungi, chlamydia, mycoplasma, herpesvirus and adenovirus in dogs with follicular conjunctivitis, erosive keratitis and chronic superficial keratitis.. Wien Tierarztl Monatsschr 2000;87:314-321.
  24. Yan. Europe : July 2018 sunniest in Danish weather history. Xinhuanet.com (online): 2018-07-31 05:00:45. http://www.xinhuanet.com/english/2018-07/31/c_137358148.htm
  25. Hurn SD, Turner AG. Ophthalmic examination findings of Thoroughbred race horses in Australia.. Vet Ophthalmol 2006;9(2):95-100.
  26. Mellersh CS. The genetics of eye disorders in the dog.. Canine Genet Epidemiol 2014;1:3.
  27. Leiva M, Pena T. Chapter 22: Diseases of the lens and cataract formation.. In: Gelatt KN, ed. Veterinary Ophthalmology, 6th ed. Wiley Blackwell; 2017:1317-1370.
  28. Plummer CE, Ramsey DT. A survey of ocular abnormalities in miniature horses.. Vet Ophthalmol 2014;14(4):239-243.
  29. Hussey GS, Goehring LS, Lunn DP. Experimentally infection with equine herpesvirus type 1 (EHV-1) induces chorioretinal lesions.. Vet Res 2013;44:118.
  30. Allbaugh RA, Townsend WM, Wilkie DA. Chapter 11: Diseases of the equine vitreous and retina.. In: Gilger BC, ed. Equine Ophthalmology, 3rd ed. Wiley Blackwell; 2017:1-71.
  31. Rebhun WC. Retinal and optic nerve diseases.. Vet Clin North Am Equine Pract 1992;8:587-608.
  32. Dwyer A, Crockett R, Kalsow C. Association of leptospiral seroreactivity and breed with uveitis and blindness in horses: 372 cases (1986-1993).. J Am Vet Med Assoc 1995;207:1327-1331.
  33. Mustikka MP, Pietilӓ EM, Mykkӓnen AK, Grӧnthal TSC. Comparison of two rebound tonometersin healthy horses.. Vet Ophthalmol 2020;23:892-898.
  34. Knollinger AM, La Croix NC, Barrett PM, Miller PE. Evaluation of a rebound tonometer for measuring intraocular pressure in dogs and horses.. Am J Vet Med Assoc 2005;227:244-248.
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