scholarly journals Optimization of large tritan stimuli by correcting for individual variations in spectral sensitivity and macular pigment distribution

2010 ◽  
Vol 8 (17) ◽  
pp. 74-74
Author(s):  
N. R. A. Parry ◽  
A. G. Robson
Keyword(s):  
Spectral Sensitivity ◽  
Macular Pigment ◽  
Individual Variations ◽  
Pigment Distribution

scholarly journals Quantifying the abnormal macular pigment distribution in macular telangiectasia type 2

2008 ◽  
Vol 86 ◽  
pp. 0-0
Author(s):  
LP VAN DER VEEN ◽  
P CHARBEL-ISSA ◽  
A STIJFS ◽  
FG HOLZ ◽  
HPN SCHOLL ◽  
...  
Keyword(s):  
Macular Pigment ◽  
Macular Telangiectasia ◽  
Pigment Distribution ◽  
Macular Telangiectasia Type 2

Long-Term Changes in Colour Matching Functions after Exposure to Artificial Sunlight

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 79-79
Author(s):  
G Jordan ◽  
J D Mollon
Keyword(s):  
Spectral Sensitivity ◽  
Macular Pigment ◽  
Stimulus Field ◽  
Substitution Method ◽  
Investigative Ophthalmology ◽  
Long Term Changes ◽  
Before And After

We have previously reported that relatively short exposures (30 to 60 min) to either sunlight or artificial sunlight are sufficient to shift Rayleigh matches for several hours in the protan direction (1995 Investigative Ophthalmology and Visual Science36 392). We have subsequently found that this effect cannot be explained by either an alteration in (i) the orientation of photoreceptors, ie no change was found in Stiles — Crawford I before and after adaptation (1995 Perception24 Supplement, 11), or by an alteration in (ii) the density of an observer's macular pigment. In order to distinguish more generally between a change in a pre-receptoral filter and a change in the spectral sensitivity of M or L cones, we are currently obtaining colour matching functions between 570 and 620 nm. Measurements are made before and after 45-min exposure to a white field receiving an illumination of about 40 000 lux from an arc lamp. The mixture primaries are 550 and 690 nm set at 100 td. The stimulus field subtends 2 deg. Matches are made by a temporal substitution method and two staircases are randomly interleaved. The standard wavelengths are randomised.

The Association of Retinal Structure and Macular Pigment Distribution

2014 ◽  
Vol 55 (2) ◽  
pp. 1169 ◽  
Author(s):  
Verena Meyer zu Westrup ◽  
Martha Dietzel ◽  
Daniel Pauleikhoff ◽  
Hans-Werner Hense
Keyword(s):  
Macular Pigment ◽  
Pigment Distribution ◽  
Retinal Structure

Retinal macular pigment distribution measured by imaging fundus reflectometry

2002 ◽  
Author(s):  
Yin Chang ◽  
Sheng-Fu Chen ◽  
Feng-Lih Lee ◽  
Shih-Jen Chen
Keyword(s):  
Macular Pigment ◽  
Fundus Reflectometry ◽  
Pigment Distribution

scholarly journals Macular pigment densities derived from central and peripheral spectral sensitivity differences

1998 ◽  
Vol 38 (21) ◽  
pp. 3233-3239 ◽  
Author(s):  
Lindsay T Sharpe ◽  
Andrew Stockman ◽  
Holger Knau ◽  
Herbert Jägle
Keyword(s):  
Spectral Sensitivity ◽  
Macular Pigment

Tracing a Metameric Match to Individual Variations of Colour Vision

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 36-36
Author(s):  
J A Diaz ◽  
A Chiron ◽  
F Viénot
Keyword(s):  
Systematic Error ◽  
Colour Vision ◽  
Macular Pigment ◽  
Normal Observer ◽  
Macular Pigment Optical Density ◽  
Long Wave ◽  
Individual Variations ◽  
Heterochromatic Flicker Photometry ◽  
Lens Density ◽  
Normal Colour

A metameric match may be accepted by one observer but rejected by another, indicating that the colour vision of the two observers is different. We analysed the variations of normal colour vision using metameric surfaces. First, we modelled the matches of a theoretical colour-normal observer on the Davidson and Hemmendinger (D&H) colour rule (Kaiser and Hemmendinger, 1980 Color Research and Applications5 65 – 71), using spectroradiometric measurements and a set of fundamentals (Stockman, Macleod, and Johnson, 1993 Journal of the Optical Society of America A10 2491 – 2521). We also derived deviate fundamentals by changing the macular pigment density, the lens density, the photopigment density, and by shifting the long-wave sensitive photopigment. Modelling the deviate normal observer matches yields shifts of no more than 1 sample on the D&H colour rule. The largest shifts are produced by changes in lens density. Second, we asked six observers to perform a match on the D&H colour rule. We also estimated their macular pigment densities and their lens densities by using heterochromatic flicker photometry matches at 466 nm and 413 nm versus a 558 nm reference, and we recorded their Nagel anomaloscope setting. Then, we computed their personalised fundamentals in order to predict their D&H colour matches. As the most frequent match in a sample of young observers is F-15 and the modelling for the theoretical observer yields G-15, a systematic error occurs in the predictions. After correction for this error, the results show that the metameric match of five out of six observers is better predicted by using the personalised correction of the lens and macular pigment optical density only, than by using the theoretical colour observer data.

ABNORMAL MACULAR PIGMENT DISTRIBUTION IN TYPE 2 IDIOPATHIC MACULAR TELANGIECTASIA

Retina ◽  
2008 ◽  
Vol 28 (6) ◽  
pp. 808-816 ◽  
Author(s):  
HANS-MARTIN HELB ◽  
PETER CHARBEL ISSA ◽  
ROB L. P. VAN DER VEEN ◽  
TOS T. J. M. BERENDSCHOT ◽  
HENDRIK P. N. SCHOLL ◽  
...  
Keyword(s):  
Macular Pigment ◽  
Macular Telangiectasia ◽  
Pigment Distribution ◽  
Idiopathic Macular Telangiectasia

Comparison of Fundus Autofluorescence and Minimum-Motion Measurements of Macular Pigment Distribution Profiles Derived from Identical Retinal Areas

Perception ◽  
10.1068/p5196 ◽  
2005 ◽  
Vol 34 (8) ◽  
pp. 1029-1034 ◽  
Author(s):  
Anthony G Robson ◽  
Glen Harding ◽  
Frederik J G M van Kuijk ◽  
Daniel Pauleikhoff ◽  
Graham E Holder ◽  
...  
Keyword(s):  
Optical Density ◽  
Linear Correlation ◽  
Fundus Autofluorescence ◽  
Macular Pigment ◽  
Scanning Laser Ophthalmoscope ◽  
Grey Scale ◽  
Circular Field ◽  
Density Values ◽  
Pigment Distribution ◽  
Motion Measurements

The optical density of macular pigment was measured at twelve retinal locations in ten subjects by minimum motion photometry, comparing 460 nm with 580 nm or 550 nm. Fundus autofluorescence images were obtained for the same subjects with a scanning laser ophthalmoscope. Optical density was computed from mean calibrated grey-scale values for a central circular field and for annular segments, identical to areas tested psychophysically, and for complete annuli. Psychophysical assessments of optical density were similar irrespective of whether 550 nm or 580 nm was used. Optical density values derived psychophysically showed a linear correlation with assessments based on identical sampled areas of annular segments (slope = 0.98, r2 = 0.97) or complete annuli (slope = 0.89, r2 = 0.96) in autofluorescence images.

Sign in / Sign up

Export Citation Format

Share Document