1. The response of the primate cone photoreceptors to sinusoidally flickering stimuli has been obtained by monitoring the late receptor potential (LRP). 2. By comparing the response characteristics of the foveal local electroretinogram (LERG) before and after the intraocular infusion of sodium aspartate, it was found that the b-wave in the foveal LERG does… (More)
A quantitative comparison is made between the psychophysical flicker response of man and similar data obtained electrophysiologically from the cones of macaque monkeys. When the psychophysical data are obtained from an eye that is strongly light-adapted, there is excellent agreement between the two sets of data at high frequencies. Under this condition,… (More)
Electrophysiological recordings of primate photorecptors have been obtained and frequency response characteristics of the red, green and blue cones have been determined and compared to previous psychophysical findings. Using cynomolgus monkeys, we recorded the foveal local electroretinogram, which is dominated by the late receptor potential, and obtained… (More)
Using the local ERG in response to a long-wavelength stimulus as an indicator, field sensitivity functions have been obtained from cynomolgus macaque monkeys (Macaca fascicularis) with flashed and sinusoidally flickering test stimuli. These functions show the reciprocal of the relative radiance, for various adapting wavelengths, required to reduce a 667-nm… (More)
The paper provides: (1) a review of the ocular cyclorotation literature; (2) an overview of the environmental factors such as posture and viewing conditions, including biocularity and distance, that can produce ocular cyclorotation; and (3) a discussion of how ocular cyclorotation can affect toric contact lens fitting and performance.
We have used signal-averaging and vector voltmeter techniques to measure the rod-cone response transition of the primate corneal electroretinogram (ERG). Lights of 580 nm or shorter wavelength, flickering sinusoidally at 5 Hz, produced nearly sinusoidal ERG's with a rod-type spectral sensitivity. For stimuli of 600 nm or longer wavelength, the ERG exhibited… (More)
A procedure is proposed for computing the visual effectiveness of light incident on the retina considering the directional sensitivity of the underlying photoreceptor population. A half-sensitivity half-width measurement of the retinal directional sensitivity provides the basis for integrating a parabolic approximation to the directional sensitivity over… (More)