Other Names: Nyctalopia
Defective night vision
Nature: Many people who score 20-20 for acuity in daylight do not test nearly so well in dim light, and may have poor ability to perceive contrasts and use peripheral vision as the light fades, or be troubled by nighttime glare.
Incidence: Of 300 Canadian research subjects, one third between the ages of 15 and 25 experienced a loss of vision at night, and about 50% of these did not realize they had a problem. Low light conditions are the most common cause of all accidents and may account for about 80% of fatalities involving bicyclists or pedestrians. In the USA in 1990, nighttime automobile accidents were about 3.7 times more common per kilometre driven than daytime accidents.
Problem Type: E: Emanations of other problems
Date of last update 24.06.2018 – 18:37 CEST