26 Questions
Based on the text, what caused the traveler to climb into the wrong car?
The traveler couldn't easily tell which car was red and which was brown
Why did the traveler give up on using the city map?
The traveler couldn't read the printed street names on the map
What made it difficult for the traveler to find the wiper switch?
The dark printed labels on the switch
According to the text, what is one of the influences on contrast sensitivity?
Level of illumination
What is the relationship between lower contrasts and discernibility?
Lower contrasts are less easily discerned
What is the effect of printing black text against a blue background, according to the text?
It reduces contrast sensitivity
Which type of visual receptor cells are exclusively found in the fovea?
Cones
What is the relationship between acuity and the spacing of the receptor cells?
Acuity decreases with greater spacing of the receptor cells
Which type of receptor cells have an advantage in terms of sensitivity?
Rods
What is scotopic vision?
Vision when only rods are operating
Which measure describes the lighting quality of a given working environment?
Illuminance
What is the ratio that defines the reflectance of a surface?
Reflectance = illuminance / luminance
Which measure determines the actual experience of visual intensity?
Luminance
Which measure represents the actual light energy of a light source?
Luminous flux
Which part of the eye is responsible for adjusting its shape to bring the image to a precise focus on the back surface of the eyeball?
Lens
What is the resting state of accommodation in the eye?
The point where the lens is doing no work at all
What is the measurement unit used to describe the amount of accommodation required to view an object at a certain distance?
Diopters
Which visual angle formula can be used to approximate the visual angle of an object of height H, viewed at distance D?
VA = \arctan(H/D)
Which visual sensory system is responsible for the ability to detect and recognize shapes?
Cones
Which of the following is true about night driving in unfamiliar locations?
It is a hazardous endeavor
What is contrast sensitivity?
The ability to detect contrast between lighter and darker spatial areas
What determines the hue of a visual stimulus?
Wavelength
What is the minimum separable acuity?
The width of light separating two dark lines
What is the range of wavelengths typically visible to the human eye?
Short wavelengths of around 400 nm to long wavelengths of around 700 nm
What spatial frequency is the human eye most sensitive to?
Around 3 c/d
What is the CIE color system used for?
Describing the combination of primary colors to match a visual stimulus
Test your knowledge on differential wavelength sensitivity and how it affects our perception of color at night. Learn why red objects appear black and how illuminating objects in red light can preserve our dark adaptation.
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