Assessment of Visual and Chromatic Functions in a Rodent Model of Retinal Degeneration

Segura, Francisco (Universidad de Zaragoza) ; Sanchez-Cano, Ana (Universidad de Zaragoza) ; Jarabo Lallana, Sebastián (Universidad de Zaragoza) ; Lopez de la Fuente, Carmen (Universidad de Zaragoza) ; Cuenca, Nicolas ; Villegas-Perez, Maria P ; Pinilla, Isabel (Universidad de Zaragoza)

Resumen: Purpose: We evaluated the photoreceptor response of pigmented P23H and normal pigmented Long Evans (LE) rats over time using functional tests in variable lighting conditions.

Methods: Pigmented P23H rats were studied by optomotor testing and electroretinogram (ERG) recordings at P30, P150, and P240. Pigmented LE rats were used as a normal wild-type control. Stimuli were modified with colored filters. Neutral density filters were used to reduce luminance.

Results: Age-related decreases in visual acuity (VA) and contrast sensitivity (CS) were observed in P23H rats. Good correlations in measurements without filter and with green filter were observed between LE and P23H P30 rat values. Differences between groups were smaller with red and purple filters. A strong relationship with luminance was observed in LE rats (VA and CS) and with P23H P30 rats (CS). A decline in the ERG responses of P23H rats was consistent with the gradual loss of photoreceptors. Differences in a- and b-wave amplitudes with different colored filters were negligible with the exception of the red filter, which resulted in smaller responses.

Conclusions: Visual function parameters decreased with age in pigmented P23H rats. Irrespective of luminance, color filter, and retinal degeneration, minimum thresholds of VA and CS were found. Smaller differences than expected were found using color filters. Responses to functional tests at long wavelengths were observed, where there is very low photoreceptor spectral sensitivity. The use of filters with functional testing could minimize light-induced retinal damage in rats.

Idioma: Inglés

DOI: 10.1167/iovs.15-17257

Año: 2015

Publicado en: Investigative ophthalmology & visual science 56, 11 (2015), 6275-6283
ISSN: 0146-0404

Factor impacto JCR: 3.427 (2015)

Categ. JCR: OPHTHALMOLOGY rank: 6 / 56 = 0.107 (2015) - Q1 - T1

Factor impacto SCIMAGO: 2.011 - Ophthalmology (Q1) - Sensory Systems (Q1) - Cellular and Molecular Neuroscience (Q2)

Financiación: info:eu-repo/grantAgreement/ES/DGA/B99
Financiación: info:eu-repo/grantAgreement/ES/ISCIII/PI13-01124
Financiación: info:eu-repo/grantAgreement/ES/ISCIII/PS090-1854
Financiación: info:eu-repo/grantAgreement/ES/ISCIII/RETICS-RD12-0034-0010

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Oftalmología (Dpto. Cirugía,Ginecol.Obstetr.)
Área (Departamento): Área Óptica (Dpto. Física Aplicada)