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Master's Dissertation
DOI
https://doi.org/10.11606/D.10.2023.tde-16062023-094841
Document
Author
Full name
Isabela Espinela Perez
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2023
Supervisor
Committee
Safatle, Angélica de Mendonça Vaz (President)
Ejzenbaum, Fabio
Munhoz, Paula Yuri Sacai
Title in Portuguese
Mensuração da acuidade visual de resolução em grades em cães da raça Pastor Belga de Malinois pelo Potencial Visual Evocado de Varredura (PVEV)
Keywords in Portuguese
Acuidade visual
Cães
Pastor Belga de Malinois
Potencial visual evocado de varredura
Abstract in Portuguese
O Potencial Visual Evocado de Varredura (PVEV), considerado um teste eletrofisiológico objetivo, que independe de informações do paciente para estabelecer resultados, tem se mostrado eficaz para mensurar a acuidade visual em seres não verbais na Medicina Veterinária. Ainda existem poucos trabalhos relacionados ao tema, tanto referente aos valores de referência de acordo com a raça e a idade quanto à padronização da técnica. Assim, no presente estudo, objetivou-se determinar a acuidade visual de resolução em grades por meio do exame de Potencial Visual Evocado de Varredura, em cães dolicocefálicos da raça Pastor Belga de Malinois, adultos, a fim de contribuir na padronização de valores de referência para a raça. Foram avaliados 12 cães da raça Pastor Belga de Malinois e, devido ao comportamento agitado e/ou agressivo, outros 12 foram excluídos. Utilizou-se o sistema eletrodiagnóstico Roland RETIport System para obtenção das respostas do PVEV, obtidas em ciclos por grau (cpg), equivalente Snellen e Log-MAR. Foi realizado uma análise estatística descritiva da refração, da biometria ocular e do Potencial Visual Evocado de Varredura, utilizando o software Prism 8.0.1 (GraphPad). O valor da média e do desvio padrão da acuidade visual em ciclos por grau e na escala de Snellen foram 9,5 ± 1,312 e 20/64 ± 8,47, respectivamente. Do total de olhos avaliados, 83,3% eram emétropes, 16,7% hipermétropes de baixo grau (+ 1,0D) e 2 olhos apresentaram astigmatismo. A refração média e o desvio padrão obtidos foram de 0,22±0,4012 D, para o olho direito, e de 0,31±0,3697 D para o olho esquerdo. Com base nos resultados, o PVEV possui aplicabilidade para a mensuração de acuidade visual em cães sem uso de contenção química, porém, o comportamento é uma limitação significativa para a realização do exame.
Title in English
Visual acuity of resolution in grids measurement by Sweep- Visual Evoked Potential (S-VEP) in Belgian Shepherd Malinois dogs
Keywords in English
Belgian Shepherd Malinois
Dogs
Sweep-Visual Evoked Potential
Visual acuity
Abstract in English
The Sweep-Visual Evoked Potential (S-VEP), considered an objective electrophysiologic test, which does not depend on patient information to establish results, has been shown to be effective in visual acuity measurement in non-verbal beings in Veterinary Medicine. There are still few works related to the subject, both regarding the reference values according to race and age and the standardization of the technique. Thus, in the present study, the objective was to determine the visual acuity of resolution in grids by means of the Sweep-Visual Evoked Potential (S-VEP) exam, in dolichocephalic dogs of the Belgian Shepherd Malinois breed, adults, in order to contribute to the standardization of reference values for the race. Twelve Belgian Malinois Shepherd dogs were evaluated and, due to agitated and/or aggressive behavior, another 12 were excluded. The Roland RETIport System electrodiagnostic system was used to obtain S-VEP responses, obtained in cycles per degree (cpg), Snellen equivalent and Log-MAR. A descriptive statistical analysis of refraction, ocular biometry and the Sweep-Visual Evoked Potential was carried out using the Prism 8.0.1 software (GraphPad). The mean and standard deviation values for visual acuity in cycles per degree and on the Snellen scale were 9,5±1,312 and 20/64±8.47, respectively. Of the total number of eyes assessed, 83.3% were emmetropic, 16.7% were low-grade hyperopic (+ 1.0D) and 2 eyes had astigmatism. The mean refraction and standard deviation obtained were 0.22±0.4012D for the right eye and 0.31±0.3697D for the left eye. Based on the results, the S-VEP has applicability for measuring visual acuity in dogs without the use of chemical restraint, however, behavior is a significant limitation for performing the test.
 
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Release Date
2025-10-09
Publishing Date
2023-10-11
 
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