• wavelength
  • It has been established that the maximum spectral sensitivity of the human eye under daylight conditions is at a wavelength of 555 nm, while at night the peak shifts to 507 nm. (wikipedia.org)
  • In sensor systems, where the output is easily quantified, the responsivity can be extended to be wavelength dependent, incorporating the spectral sensitivity. (wikipedia.org)
  • In other contexts, the spectral sensitivity is expressed as the relative response per light energy, rather than per quantum, normalized to a peak value of 1, and a quantum efficiency is used to calibrate the sensitivity at that peak wavelength. (wikipedia.org)
  • logMAR
  • Median differences between Y-VA examinations (repeatability) were 0 LogMAR except between examinations 1 and 2 at the 25% contrast level, where it was 0.3 LogMAR. (diva-portal.org)
  • scotopic
  • Scotopic vision Mesopic vision Candela Purkinje effect Photometry Photosensitive ganglion cell Adaptation (eye) Contrast (vision) Cone cell Pelz, J. (1993). (wikipedia.org)
  • color vision
  • In spite of these complexities, however, the conversion of light energy spectra to the effective stimulus, the excitation of the photopigment, is quite linear, and linear characterizations such as spectral sensitivity are therefore quite useful in describing many properties of color vision. (wikipedia.org)
  • Results
  • In dry eye, reduced contrast sensitivity in part results from central SPK overlying the optical zone and the increased straylight results from tear film instability rather than central SPK. (arvojournals.org)
  • refractive
  • CamBlobs2 is less dependent on viewing distance and refractive error than letter or grating contrast tests and has the potential to allow patient self-assessment of CS outside the doctor's office. (arvojournals.org)
  • describe
  • In visual neuroscience, spectral sensitivity is used to describe the different characteristics of the photopigments in the rod cells and cone cells in the retina of the eye. (wikipedia.org)
  • In photography, film and sensors are often described in terms of their spectral sensitivity, to supplement their characteristic curves that describe their responsivity. (wikipedia.org)
  • movements
  • This study estimates contrast sensitivity and spatial resolution of two species of benthic sharks, the Port Jackson shark, Heterodontus portusjacksoni , and the brown-banded bamboo shark, Chiloscyllium punctatum, by recording eye movements in response to optokinetic stimuli. (biologists.org)
  • Eye movements ceased at 0.38 cycles per degree, even for high contrasts, suggesting low spatial resolution. (biologists.org)
  • conditions
  • The most important variables, in addition to size, that determine visibility under these conditions are the contrast of the target against a background, and whether it is moving or flickering on and off. (druglibrary.org)
  • Under normal conditions, contrast sensitivity in Yellow-IOL group is better than that of UV-IOL group at all frequency regions. (arvojournals.org)
  • assess
  • At their first visit, the first 22 subjects also completed a test in which the contrast blobs were of various sizes (13, 9, 6 mm) to assess the effect of angular subtense of blobs on CS. (arvojournals.org)
  • Linear regressions (slope of performance with time) were done to assess whether subjects had the same, improved, or worse contrast sensitivity. (arvojournals.org)
  • However
  • However, there are several techniques that permit not only the evaluation of contrast sensitivity, but also allow researchers to obtain a more complete description of the overall functioning of the visual system (Campbell & Green, 1965). (druglibrary.org)
  • The responses of the rod and cone cells of the retina, however, have a very context-dependent (coupled) nonlinear response, which complicates the analysis of their spectral sensitivities from experimental data. (wikipedia.org)
  • reduction
  • This is how a reduction of contrast can reduce the clarity of an image - by removing its fine details. (wikipedia.org)
  • A major drawback to application of the algorithm is an inherent reduction in overall image contrast produced by the operation. (wikipedia.org)