The spectral sensitivity of the eye was investigated using reaction times to broadband chromatic stimuli over a range of background luminances. Relative sensitivity was determined from the nonlinear reaction time curve by converting reaction times to a linear measure that was independent of spectral sensitivity. Two models for mesopic spectral sensitivity were compared. The first was a linear c...

PURPOSE To evaluate whether visual performance could be improved in pseudophakic subjects by correcting low levels of postoperative astigmatism. METHODS An exploratory, noninterventional study was conducted using subjects who had been implanted with an aspheric intraocular lens and had 0.5-0.75 diopter postoperative astigmatism. Monocular visual performance using full correction was compared ...

Purpose To explore the differential effects of age and eccentricity on perception motion at photopic mesopic light levels. Methods Thirty-six visually normal participants (18 younger; mean 25 years, range: 20–31) older; 70 60–79) underwent two testing sessions, one In each session, was tested binocularly eccentricities (centrally, peripherally 15° rightwards 5° superior to horizontal) for four ...

A study by Gao et al found that the Newton method may not converge for certain combinations of photopic luminance and ratio scotopic computing adaptation coefficient m, CIE MES2 system mesopic photometry. Hence, they proposed to use Bisection-Newton method. In this short note, we propose with a new initial guess m. Numerical simulation has shown only converges, but also converges faster than

Color vision is one of the most intriguing phenomena of the visual experience and has been the object of study from vision scientists to philosophers of perception. The wavelengths, their intensity and purity are experienced as hue, brightness and saturation based on complex information processing of the light entering the eyes. This special research topic is devoted to covering from basic aspe...

Mechanisms of light adaptation have been traditionally explained with reference to psychophysical experimentation. However, the neural substrata involved in those mechanisms remain to be elucidated. Our study analyzed links between psychophysical measurements and retinal physiological evidence with consideration for the phenomena of rod-cone interactions, photon noise, and spatial summation. Th...