Incidence of Red-Green colour blindness was studied in a Libyan population and was then compared with the same in two samples of Indian population. The incidence of the Red-Green colour defect was found to be 2.209% amongst the males and 0.0% amongst the females in the Libyan study. However, the incidence was only 1.841% amongst the ethnic Libyan males. This incidence was comparable with those ...

When are people sensitive to the magnitude of numerical information presented in unfamiliar units, such as a price in a foreign currency or a measurement of an unfamiliar product attribute? We propose that people exhibit deliberational blindness, a failure to consider the meaning of even unfamiliar units. When an unfamiliar unit is not salient, people fail to take their lack of knowledge into a...

Observations of afterimages indicate that red and green cone sensitivities can be modified jndependentiy by bieaehing. providing a way to estimate their sensitivities in the normal eye. The fovea1 afterimage of a red and green bipartite held is allowed to fade against a steady red background. A change of background color from red to green generally revives a bipartite afterimage. If two conditi...

Two sources of data (a blind register and the records of a glaucoma clinic) were used to study the age, sex, and ethnic characteristics of sufferers of glaucomatous blindness in the Negev region of Israel. Glaucoma was found to be the cause of blindness relatively infrequently (10% of eyes) among the registered blind population. The rate of blindness from glaucoma in the population was 0.38/100...

This paper employs uniform color space to analyze relations in dichromacy (protanopia, deuteranopia, tritanopia). Fifty percent or less of dichromats represent the classical reduction form of trichromacy, where one of three cones is inoperative but normal trichromatic color mixture such as complementary colors (pairs that mix white) are accepted by the dichromat, whose data can thus be plotted ...

Neurobiological and molecular studies suggest a dichromatic colour vision in canine species, which appears to be similar to that of human red-green colour blindness. Here, we show that dogs exhibit a behavioural response similar to that of red-green blind human subjects when tested with a modified version of a test commonly used for the diagnosis of human deuteranopia (i.e. the Ishihara's test)...