Despite Different Wall Colors, Vertical Scotopic Illuminance Predicts Pupil Size

The significance of changes in pupil size during straylight measurement and with varying environmental illuminance.

PURPOSE In this work, we investigated the pupillary conditions during straylight measurement, and the potential effect this might have on the measured straylight. METHODS Five young (26-29-years-old) and 15 older (50-68-years-old) individuals participated in this study. First, the pupil diameter of both eyes was measured at three room illuminances. Next, straylight was assessed at two room il...

Visual Search for Safety Colors under Low Illuminance Conditions

This study aims to examine the search efficiency under low illuminance conditions for three safety colors; red, orange and yellow, which are used for danger and caution signs. They are subjected to a visual search task. Images of visual stimuli consisting of an array of colored circles placed on a large visual field (a visual angle of 40 deg.) were displayed on an 80-inch screen through a proje...

Vertical Illuminance Measurement for Clear Skies in Tehran

Pupil size in diabetes.

Sympathetic function was studied in 101 diabetic children and 102 age and sex matched control children, as part of a longitudinal study of the evolution of microvascular disease in the population of diabetic children and adolescents in Avon County. The median (range) age of the diabetic population was 13.5 (6.0-17.2) years, the duration of diabetes was 4.0 (0.4-13.9) years, and glycated haemogl...

Pupil Size and Mental Load

This experiment explores whether the size of human pupil dilation is a measure that can discriminate between easier and harder intellectual tasks undertaken by the participant when information is displayed on a computer monitor. While it has been previously found that a participant’s pupil dilation will be larger during harder intellectual tasks, these experiments have not generally been conduc...