Observer differences in color-mixture functions studied by means of a pair of metameric grays

Abstract

The Granville metameri c gray p anels have served t o characterize t he color vis ion of obser vers in a n a pproximate bu t useful way. Thu s, t he 39 observers st udi ed , an d t he fo ur color-m ixt ure fun ctions were classed i nto fi ve groups according to t he ir indica ted amo un ts of ocular pigmen tatio n. These p a nels wer e also used to m eas ure t he correlation of le ns a nd macular pigmentations wi th observer age, sex, a nd eye and ha ir colors. Of the three sets of color-m ixture fu nctio!ls inte nded to refer to 2° fi eld obser vation, t he 1931 Co mm ission Interna tiona le d e L 'Eclairage standa rd observer agrees best. _ These d ata thus a fford no basis for supplan t ing t he 193 1 Commiss ion Internat io nale de L' Ecla irage standard observer wi t h either t he J udd" i" or t he 1955 Stiles' 2° color-mixture t unctio n . The 1955 Stil es' 10° fu nctions, however, agree fa irly well.

Guest editorial: Notes on the macular pigment

“…Yet, even when MP had been objectively shown to exist in the living eye (Wald, 1950), it was believed to be part of the human ageing process. Data obtained from metameric colour matches did not, in contrast, vary with age (Kelly, 1958): this seemed inconsistent with the increase in MP absorbance earlier hypothesized by Wright (1950). However, Hess (1911) had reported in a convincing study that the human eyelens yellows with age, and this was confirmed in a study by Said and Weale (1959): Wright's results are, therefore, better interpreted in terms of lenticular senescence than in those of the MP.…”

Colors Do Look Different after a Lens Implant!

“…fields and larger the latter has little effect [8]. Additionally, variation among observers in the amount of yellow pigment in the lens and macula has long been recognized, although for 10?…”