dark adaptation


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dark adaptation

The process by which the iris and the retina of the eye adjust to allow maximum vision in dim illumination following exposure of the eye to a relatively brighter illumination. In darkness, vision becomes more sensitive to light, provided a person has not been exposed to bright light for some time. Although exposure to total darkness for at least 30 minutes is required for complete dark adaptation, a pilot can achieve a moderate degree within 20 minutes under dim red cockpit lighting. Dark adaptation is impaired by exposure to cabin pressure altitudes above 5000 ft, carbon monoxide inhaled in smoking and from exhaust fumes, deficiency of vitamin A in the diet, and prolonged exposure to bright sunlight.
References in periodicals archive ?
Currently, select UC Davis Medical Center patient rooms and their window-adjacent corridors and parking areas are being designed with lighting systems that adhere to the Five Key Circadian and Lighting Quality Design Strategies and promoting the key design criteria of circadian wellness, dark adaptation and a high-fidelity visual environment for patient care.
Measurement of the full cone and rod components of dark adaptation is very time-consuming, often leading to increased variability in the results and making it unsuitable for routine clinical use.
They also recommended closer analysis of extracts from southern Europe and the uniform adoption of modern ophthalmologic methodology for the measurement of dark adaptation and scotopic and mesopic visual acuity.
Contrast sensitivity, colour vision and dark adaptation have all been found to be impaired in CF patients.
And as Americans age, millions experience a dramatic slowing in dark adaptation that may impact night driving and/or macular degeneration that gradually destroys sharp, central vision that is needed for seeing objects clearly and for common daily tasks such as reading and driving.
Drape a dark towel over your head and eyepiece to cut out stray light; you'll need all the dark adaptation you can get.
Maintaining dark adaptation also explains all the red flashlights you see being used in the field to illuminate star maps and set up equipment.
So with red light, we can use our daytime vision without "saturating" our nighttime detectors, and this is why red light preserves our dark adaptation.
In addition, the section also explains changes in dark adaptation, contrast sensitivity, attention, temporal and spatial interaction, refraction and motility that occur with age.