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Proceedings Paper

Resolution in two-photon infrared vision (Conference Presentation)
Author(s): Pablo Artal; Katarzyna Komar; Adrian Gambin; Silvestre Manzanera; Maciej Wojtkowski

Paper Abstract

Human subjects can detect infrared light at wavelengths over 1000 nm perceived as visible of the corresponding half wavelength. This is due to a two-photon process and requires the use of pulsed light sources well focused within the retina. We have developed an experimental system to measure, for the first time, the visual resolution of the eye when is stimulated with infrared (1043 nm) and compared with visible light (543 nm). Scanner mirrors were used to project letters of different sizes onto the retina in both wavelengths. Subjects performed a visual test to determine the smallest letter size that was distinguishable for each wavelength for a range of defocus values. An additional optical path was used to record the retinal images of the spot after reflection in the retina and double-pass through the optical media. The best visual acuity was obtained at different defocus locations corresponding to the chromatic difference between green and infrared. Although, there was some individual variability, visual acuity was found to be similar both in visible and infrared. The use of two-photon infrared vision may have some potential applications for vision in those cases were the optical media is opaque to visible wavelengths while keeping some transparency in the infrared.

Paper Details

Date Published: 24 April 2017
PDF: 1 pages
Proc. SPIE 10073, Adaptive Optics and Wavefront Control for Biological Systems III, 100730V (24 April 2017); doi: 10.1117/12.2252586
Show Author Affiliations
Pablo Artal, Lab. de Óptica Univ. de Murcia (Spain)
Katarzyna Komar, Nicolaus Copernicus Univ. (Poland)
Adrian Gambin, Univ. de Murcia (Spain)
Silvestre Manzanera, Univ. de Murcia (Spain)
Maciej Wojtkowski, Nicolaus Copernicus Univ. (Poland)

Published in SPIE Proceedings Vol. 10073:
Adaptive Optics and Wavefront Control for Biological Systems III
Thomas G. Bifano; Joel Kubby; Sylvain Gigan, Editor(s)

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