RT info:eu-repo/semantics/article T1 Influence of age and spectral power distribution on mesopic visual sensitivity A1 García Vicente, Eduardo A1 Arranz de la Fuente, Isabel A1 Issolio, Luis A1 Martínez Matesanz, Cristina Beatriz A1 Hernán Gloriani, Alejandro A1 Menéndez Blanco, Andrés A1 Rodríguez Rosa, Miguel A1 Silva, Bárbara A1 Colombo, Elisa A1 Mar Sardaña, Santiago A1 Aparicio Calzada, Juan Antonio K1 Aging K1 Envejecimiento K1 Visual perception K1 Percepción visual K1 2209.15 Optometría AB The ability of the human visual system to detect stimuli at low illumination levels provides awareness of potential risks. Theinfluence of age and spectral power distribution on mesopic spectral sensitivity is analyzed. Two typical light sources are used, ahigh-pressure sodium lamp (HPS), with a higher content of long wavelengths, and a metal halide lamp (MH), with a highercontent of short wavelengths. Two experiments were performed, using a two-channel Maxwellian-view optical system tomeasure contrast threshold under different experimental conditions. In Experiment 1, three age groups (young, middle-agedand old, n = 2 each), two retinal locations (on-axis and off-axis vision), four background luminances (0.01, 0.07, 0.45, and 3.2 cd/m2), and two photometry systems (photopic and the MES2 systems) were considered. In Experiment 2, contrast thresholdmeasurement was performed with two age groups (young and old, n = 11 each), one retinal location (off-axis vision), onebackground luminance (0.01 cd/m2), and two photometry systems (photopic and the MES2 systems). In on-axis vision, neitherage nor spectral power distribution have an effect on the contrast threshold. In off-axis vision, however, a significant interactionbetween age and spectral power distribution is obtained, albeit only at 0.01 cd/m2 with an MH lamp. Only at this lowestbackground luminance was the greater content of short wavelengths of this lamp responsible for higher rod stimulation in offaxis vision, with the subsequent improvement in detection performance in young subjects. However, the effect of diffused lightinside the aged eye counteracted the benefits of increased rod sensitivity for the MH lamp. PB Springer Link SN 1943-393X YR 2019 FD 2019 LK http://uvadoc.uva.es/handle/10324/45125 UL http://uvadoc.uva.es/handle/10324/45125 LA eng NO Attention, Perception, & Psychophysics, 2019, vol. 81. p. 504-516 NO Producción Científica DS UVaDOC RD 29-mar-2024