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  • intraocular
  • To determine the effectiveness of this foldable yellow-tinted intraocular lens (Yellow-IOL) in improving the quality of vision, we measured contrast sensitivity during the early postoperative period in eyes implanted with the Yellow-IOL or ordinary foldable intraocular lenses (UV-IOL). (arvojournals.org)
  • To assess contrast sensitivity (CS) both with and without the presence of glare, in patients implanted bilaterally with light-adjustable intraocular lenses (LALs).Patients were treated to have one eye set to emmetropia and the contralateral with induced negative spherical aberration (SA) to increase the depth of focus. (arvojournals.org)
  • Refractive "vision correction" surgery (especially PRK with the complication of "haze") may rarely cause a reduction in best night-time acuity due to the impairment of contrast sensitivity function (CSF) which is induced by intraocular light-scatter resulting from surgical intervention in the natural structural integrity of the cornea. (wikipedia.org)
  • Scotopic
  • Scotopic contract sensitivity showed the highest correlation with slant detection range (0.83). (semanticscholar.org)
  • Scotopic vision Mesopic vision Candela Purkinje effect Photometry Photosensitive ganglion cell Adaptation (eye) Contrast (vision) Cone cell Pelz, J. (1993). (wikipedia.org)
  • Humans
  • It has long been known, for example, that reserpine, a drug which is prescribed for psychosis and hypertension and which induces depression in humans, causes excessive sensitivity to light in various animals. (scienceblogs.com)
  • Conclusions
  • CONCLUSIONS: The simulations allow us to learn about the different types of distortions that can be experienced by a subject with impaired contrast sensitivities (blur, haloes, color shifts, local or global contrast, brightness and colorfulness reductions, etc.) and highlight the difficulties arising when trying to predict the quality of the final image from the losses in the individual mechanisms. (biomedsearch.com)
  • Conclusions: The blurred vision caused by exposure to TEA can be documented by measuring contrast sensitivity. (ebscohost.com)
  • peak
  • They say that an ideal contrast sensitivity test would evaluate peak contrast sensitivity function, be reliable and not be influenced by language ability. (aao.org)
  • Peak values of the CSFs occur at smaller spatial frequencies compared with the 2-degree field, and the values of contrast sensitivity for the 10-degree case are greater at all spatial frequencies compared with the 2-degree case. (rpi.edu)
  • 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 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)
  • methods
  • This article reviews the importance of contrast sensitivity to vision and its role in identifying many ocular diseases, and compares the strengths and weaknesses of contrast sensitivity testing methods. (aao.org)
  • For their latest study, van Elst's group sought to confirm their previous findings using objective methods, and to determine if any observed changes in the contrast sensitivity of depressed patients are due to changes in the eye or brain. (scienceblogs.com)
  • When a system's responsivity is a fixed monotonic nonlinear function, thatnonlinearity can be estimated and corrected for, to determine the spectral sensitivity from spectral input-output data via standard linear methods. (wikipedia.org)
  • wavelength
  • Spectral sensitivity is the relative efficiency of detection, of light or other signal, as a function of the frequency or wavelength of the signal. (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)
  • Spectral sensitivity is sometimes expressed as a quantum efficiency, that is, as probability of getting a quantum reaction, such as a captured electron, to a quantum of light, as a function of wavelength. (wikipedia.org)
  • vision
  • Conversely, some people achieve better contrast sensitivity and night vision after LASIK, compared with their vision with glasses or contact lenses before the procedure. (allaboutvision.com)
  • Low vision often causes decreased contrast sensitivity as well as reduced resolution, making it more difficult to see low-contrast images on SVD devices. (thefreedictionary.com)
  • Our results suggest that vision in sharks is not 'poor' as previously suggested, but optimised for contrast detection rather than spatial resolution. (biologists.org)
  • The online VCS Test is a measure of one of the neurologic functions of vision called contrast . (survivingmold.com)
  • To compare contrast sensitivity, acquired color vision deficiency, and reading ability in patients with glaucoma at different stages of the disease and to establish correlations between visual field parameters and visual function scores. (hindawi.com)
  • Objectives: To determine whether blurred vision caused by exposure to triethylamine (TEA) can be detected by the measurement of contrast sensitivity. (ebscohost.com)
  • There are numerous variants of the LEA test which can be used to assess the visual capabilities of near vision and distance vision, as well as several other aspects of occupational health, such as contrast sensitivity, visual field, color vision, visual adaptation, motion perception, and ocular function and accommodation (eye). (wikipedia.org)
  • Their sensitivity ranges overlap to provide vision throughout the visible spectrum. (wikipedia.org)
  • Contrast vision may also be greatly reduced. (wikipedia.org)
  • For X-ray films, the spectral sensitivity is chosen to be appropriate to the phosphors that respond to X-rays, rather than being related to human vision. (wikipedia.org)
  • 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)
  • color
  • These filters, except for the global scaling, are the subject's contrast sensitivity functions measured along the cardinal directions of the color space. (biomedsearch.com)
  • Hering, starting from observations on color appearance, had proposed that the percept of color emerged from spectrally-opponent mechanisms in the visual system that contrasted red vs green and blue vs yellow. (wikipedia.org)
  • What is the space of spectral sensitivity functions for digital color cameras? (wikipedia.org)
  • differences
  • Specifically, the researchers looked for differences between the two groups of participants in activity reflecting contrast gain , the process by which cells in the retina adapt to variance in the light intensity of the visual scene so that the amount of information extracted from it can be maximized. (scienceblogs.com)
  • Better
  • Those taking medication for their depression, however, had slightly lower depressivity scores and correspondingly better contrast gain than unmedicated patients. (scienceblogs.com)
  • Under normal conditions, contrast sensitivity in Yellow-IOL group is better than that of UV-IOL group at all frequency regions. (arvojournals.org)
  • stimuli
  • The PERG is evoked by viewing patterned stimuli and, in this case, its size is indicative of contrast gain. (scienceblogs.com)
  • 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)
  • 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)
  • reduction
  • The participants diagnosed with depression displayed a marked reduction in contrast gain when compared with the controls. (scienceblogs.com)
  • Furthermore, the reduction in contrast gain was strongly correlated with the severity of depression - the more severe the depression, the greater was the observed reduction in contrast gain. (scienceblogs.com)
  • The intensity of the treatment, or dose being taken, did not affect the reduction in contrast gain observed in the depressed patients. (scienceblogs.com)
  • 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)
  • normal
  • The authors conclude that it is important for a contrast sensitivity testing method to have strong reliability to differentiate normal from abnormal and to determine whether progression is real. (aao.org)
  • Reduced contrast sensitivity of neurons in the three cortical areas was accompanied by enhanced maximal visual response, increased spontaneous activity, and decreased signal-to-noise ratio, while LGN neurons exhibited largely normal response properties. (frontiersin.org)
  • high
  • In this regard, determining a person's CSF is much like evaluating the sensitivity of his or her hearing, which involves using tones of low and high pitch as well as variations in volume. (allaboutvision.com)
  • In the current study, the contrast response function, one of the most important properties of neurons from early visual areas to high brain areas, was systematically compared along the visual pathway, including the lateral geniculate nucleus (LGN), early visual cortices (A17 and A18), and posteromedial lateral suprasylvian cortex (PMLS, analog to the medial temporal area (MT) in monkeys) of young and old cats. (frontiersin.org)
  • agents
  • A critically underdeveloped area in PAT is the development of contrast agents. (nsti.org)
  • Here we present a broad evaluation of gold-containing nanoparticle for PAT contrast agents with different sizes and optical absorption properties. (nsti.org)
  • In summary we have demonstrated the capability of preparing the optimal contrast agents for PAT by fine-tuning the size, and the composition of the nanoparticles. (nsti.org)
  • If your immune system is stressed in any way, or if you are extremely sensitive and have allergy-like reactions to a variety of agents ( see Multiple Chemical Sensitivity syndrome or MCS) , then you may be even MORE sensitive to mold than the average person and have chronic symptoms directly related to mold in your environment. (pureairtwins.com)
  • good
  • Maintaining the good manners, consideration, and sensitivity of the older type, Wentworth adds the qualities of gallantry, independence, and bravery that come with being a well-respected Naval officer. (wikipedia.org)
  • He has made his own fortune through hard work and good sense, in direct contrast to Sir Walter who has only wasted the money that came to him through his title. (wikipedia.org)