Accommodation with and without short-wavelength-sensitive cones and chromatic aberration

• Published in: Vision research (Oxford) Vol. 45; no. 10; pp. 1265 - 1274
• Main Authors: Kruger, Philip B., Rucker, Frances J., Hu, Caitlin, Rutman, Hadassa, Schmidt, Nathan W., Roditis, Vasilios
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.05.2005; Elsevier Science
• Subjects: Accommodation; Accommodation, Ocular - physiology; Adult; Biological and medical sciences; Blur; Chromatic aberration; Color Perception - physiology; Defocus; Fundamental and applied biological sciences. Psychology; Humans; Optometry - methods; Perception; Photic Stimulation - methods; Psychology. Psychoanalysis. Psychiatry; Psychology. Psychophysiology; Refraction, Ocular - physiology; Retinal Cone Photoreceptor Cells - physiology; Short-wavelength-sensitive cones; Vision; Blur; Short-wavelength-sensitive cones; Accommodation; Defocus; Chromatic aberration; Human; Cone; Photoreceptor; Retina; Wavelength; Eye; Visual system; Spatial frequency; Visual stimulus; Follow up study
• ISSN: 0042-6989; 1878-5646
• DOI: 10.1016/j.visres.2004.11.017

Accommodation was monitored while observers (23) viewed a square-wave grating (2.2 cycles/deg; 0.53 contrast) in a Badal optometer. The grating moved sinusoidally (0.2 Hz) to provide a stimulus between −1.00 D and −3.00 D during trials lasting 40.96 s. There were three illumination conditions: 1. Monochromatic 550 nm light to stimulate long-wavelength-sensitive cones (L-cones) and medium-wavelength-sensitive cones (M-cones) without chromatic aberration; 2. Monochromatic 550 nm light + 420 nm light to stimulate long-, medium- and short-wavelength-sensitive cones (S-cones) with longitudinal chromatic aberration (LCA); 3. Monochromatic 550 nm light + 420 nm light to stimulate L-, M- and S-cones viewed through an achromatizing lens. In the presence of LCA mean dynamic gain decreased ( p = 0.0003; ANOVA) and mean accommodation level was reduced ( p = 0.001; ANOVA). The reduction in gain and increased lag of accommodation in the presence of LCA could result from a blue-yellow chromatic signal or from a larger depth-of-focus.