Spectral Effect of multi-chip LED on Color Contrast Sensitivity with SPD Tuning

2014 ◽  
Author(s):  
Liting Jiang ◽  
Peng Jin
Keyword(s):  
Contrast Sensitivity ◽  
Color Contrast ◽  
Spectral Effect

scholarly journals Color, contrast sensitivity, and the cone mosaic.

1993 ◽  
Vol 90 (21) ◽  
pp. 9770-9777 ◽  
Author(s):  
D. Williams ◽  
N. Sekiguchi ◽  
D. Brainard
Keyword(s):  
Contrast Sensitivity ◽  
Color Contrast ◽  
Cone Mosaic

Perceived Color of Hallucinations in the Charles Bonnet Syndrome Is Related to Residual Color Contrast Sensitivity

2009 ◽  
Vol 29 (3) ◽  
pp. 192-196 ◽  
Author(s):  
Stephen A Madill ◽  
Gerassimos Lascaratos ◽  
Geoffrey B Arden ◽  
Dominic H ffytche
Keyword(s):  
Contrast Sensitivity ◽  
Color Contrast ◽  
Charles Bonnet Syndrome ◽  
Perceived Color

scholarly journals Practical Color Contrast Sensitivity Functions for Luminance Levels up to 10000 cd/m2

2020 ◽  
Vol 2020 (28) ◽  
pp. 1-6
Author(s):  
Rafał K. Mantiuk ◽  
Minjung Kim ◽  
Maliha Ashraf ◽  
Qiang Xu ◽  
M. Ronnier Luo ◽  
...  
Keyword(s):  
Contrast Sensitivity ◽  
Dynamic Range ◽  
Color Space ◽  
High Dynamic Range ◽  
Model Parameters ◽  
Color Contrast ◽  
Sensitivity Functions ◽  
Spatial Frequencies ◽  
Wide Range ◽  
Opponent Color

We model color contrast sensitivity for Gabor patches as a function of spatial frequency, luminance and chromacity of the background, modulation direction in the color space and stimulus size. To fit the model parameters, we combine the data from five independent datasets, which let us make predictions for background luminance levels between 0.0002 cd/m2 and 10 000 cd/m2, and for spatial frequencies between 0.06 cpd and 32 cpd. The data are well-explained by two models: a model that encodes cone contrast and a model that encodes postreceptoral, opponent-color contrast. Our intention is to create practical models, which can well explain the detection performance for natural viewing in a wide range of conditions. As our models are fitted to the data spanning very large range of luminance, they can find applications in modeling visual performance for high dynamic range and augmented reality displays.

scholarly journals The ChromaTest, a digital color contrast sensitivity analyzer, for diabetic maculopathy: a pilot study

2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Roger Wong ◽  
Jaheed Khan ◽  
Temi Adewoyin ◽  
Sobha Sivaprasad ◽  
Geoffrey B Arden ◽  
...  
Keyword(s):  
Pilot Study ◽  
Contrast Sensitivity ◽  
Color Contrast ◽  
Diabetic Maculopathy

Age-Related Effects of Glare on Luminance and Color Contrast Sensitivity

1994 ◽  
Vol 71 (12) ◽  
pp. 792-796 ◽  
Author(s):  
RICHARD STEEN ◽  
DAVID WHITAKER ◽  
DAVID B. ELLIOTT ◽  
JOHN M. WILD
Keyword(s):  
Contrast Sensitivity ◽  
Color Contrast ◽  
Age Related

scholarly journals Mouse color and wavelength-specific luminance contrast sensitivity are non-uniform across visual space

eLife ◽  
2018 ◽  
Vol 7 ◽  
Author(s):  
Daniel J Denman ◽  
Jennifer A Luviano ◽  
Douglas R Ollerenshaw ◽  
Sissy Cross ◽  
Derric Williams ◽  
...  
Keyword(s):  
Contrast Sensitivity ◽  
Visual Space ◽  
Color Discrimination ◽  
Luminance Contrast ◽  
Neural Systems ◽  
Mouse Retina ◽  
Color Contrast ◽  
Cone Opsin ◽  
Cell Type Specific ◽  
Cone Opsins

Mammalian visual behaviors, as well as responses in the neural systems underlying these behaviors, are driven by luminance and color contrast. With constantly improving tools for measuring activity in cell-type-specific populations in the mouse during visual behavior, it is important to define the extent of luminance and color information that is behaviorally accessible to the mouse. A non-uniform distribution of cone opsins in the mouse retina potentially complicates both luminance and color sensitivity; opposing gradients of short (UV-shifted) and middle (blue/green) cone opsins suggest that color discrimination and wavelength-specific luminance contrast sensitivity may differ with retinotopic location. Here we ask how well mice can discriminate color and wavelength-specific luminance changes across visuotopic space. We found that mice were able to discriminate color and were able to do so more broadly across visuotopic space than expected from the cone-opsin distribution. We also found wavelength-band-specific differences in luminance sensitivity.

scholarly journals The Effect of Hypothyroidism on Color Contrast Sensitivity: A Prospective Study

2015 ◽  
Vol 4 (1) ◽  
pp. 43-47 ◽  
Author(s):  
Mehtap Cakir ◽  
Banu Turgut Ozturk ◽  
Elif Turan ◽  
Gulsum Gonulalan ◽  
Ilker Polat ◽  
...  
Keyword(s):  
Contrast Sensitivity ◽  
Color Vision ◽  
Sensitivity Analyses ◽  
Contrast Threshold ◽  
Color Contrast ◽  
Cone Opsin ◽  
Yellow Color ◽  
Median Period ◽  
A Prospective Study ◽  
Retinal Cone

Background: Thyroid hormone has been shown to control retinal cone opsin expression, the protein of color vision, in adult rodents. Objectives: The aim of this study was to evaluate the effect of hypothyroidism on color contrast sensitivity in adult overt hypothyroid patients. Methods: Thirty-eight overt hypothyroid (31 females, 7 males) subjects and 20 euthyroid (16 females, 4 males) controls were studied prospectively. Color vision examination was performed by Chromatest, a software program analyzing the tritan (blue-yellow) color contrast threshold (tritan CCT) and protan (red-green) color contrast threshold (protan CCT). Color contrast sensitivity analyses of hypothyroid subjects were performed on admission and after L-thyroxine treatment when biochemical euthyroidism was achieved. Results: After a median period of 90 (90-210) days, 24 (19 females, 5 males) patients were euthyroid and eligible for a second color vision examination. Baseline tritan CCT and protan CCT values were significantly higher in the hypothyroid group compared to euthyroid controls, which clinically translates into impaired color contrast sensitivity (p < 0.001 and p < 0.001, respectively). There was a significant decrease in tritan CCT (p = 0.002) and protan CCT (p < 0.001) values in the hypothyroid group after euthyroidism was achieved, which denotes improvement in color contrast sensitivity. Conclusions: It is a novel finding of the current study that color contrast sensitivity is impaired in hypothyroidism and significantly improves after euthyroidism is achieved.

scholarly journals Use of the King-Devick Variable Color Contrast Sensitivity Chart to differentiate stages of age-related macular degeneration

2020 ◽  
Vol 5 (1) ◽  
pp. e000451
Author(s):  
Shaun Ittiara ◽  
Anya S Hariprasad ◽  
Leonard V Messner ◽  
David J Tresley ◽  
Danielle Leong ◽  
...  
Keyword(s):  
Macular Degeneration ◽  
Contrast Sensitivity ◽  
Age Related Macular Degeneration ◽  
Control Group ◽  
Color Contrast ◽  
Healthy Controls ◽  
Clinical Practices ◽  
Exudative Amd ◽  
Colour Contrast ◽  
Age Related

ObjectiveThis study aimed to determine which colour contrast sensitivity differences exist in early to advanced age-related macular degeneration (AMD) and examine the potential utility of the King-Devick Variable Color Contrast Sensitivity Chart in detecting AMD severity.Methods and analysisA total of 85 participants (144 total eyes) were recruited from multiple clinical practices and enrolled in the study. The control group consisted of 57 healthy eyes. The non-exudative AMD (NE-AMD) group consisted of 45 eyes. The exudative AMD (E-AMD) group consisted of 42 eyes. In a single study visit, monocular best-corrected visual acuity (BCVA) at 40 cm with 100% black contrast was determined for each eye. Using the BCVA line, the number of letters correctly identified (out of 10) was recorded for various colour presentations (red, green, blue and yellow) and at decreasing contrast levels (100%, 75%, 50% and 25%).ResultsOur results show worse visual performance under various colour contrast settings in E-AMD patients compared with healthy controls and NE-AMD. Colour contrast performance using blue and yellow differentiated more advanced stages of disease in E-AMD from earlier NE-AMD disease. Blue and black colour contrast performance more accurately identified the E-AMD group from healthy controls and the NE-AMD group.ConclusionThe findings of this study demonstrate that colour contrast, particularly with black, blue and yellow, is impaired in E-AMD suggesting the potential for colour contrast measures to serve as an adjunctive clinical tool in identifying subtle altered visual function as well as the potential for detecting disease severity.

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