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Vis Perc Practice Exam Questions with
Correct Answers
What percentage of the eye's refractive power is provided by the cornea? - ANSWER✔✔-67%
The nonphotosensitive pigment that coveres the surface of the macula lutea may protect this tissue by
absorbing - ANSWER✔✔-blue light
The thickness of the retina is - ANSWER✔✔-0.20 mm
Excessive exposure to UVC is most often associated with inflammation of the - ANSWER✔✔-cornea
A rod monochromat views the following four patches of monochromatic light: 440 nm, 510 n, 555 nm,
and 565 nm. Each patch produces 20 quantal absorptions. Which is brightest? - ANSWER✔✔-510 nm
Threshold contrast, under photopic conditions, is closest to - ANSWER✔✔-0.010
To optimize the rod-cone break of the dark adaptation curve for clinical testing, the stimulus should be -
ANSWER✔✔-5.0 degree diameter and green
Consider the region of the light adaptation curve that follows Weber's law. As the background intensity
decreases, contrast sensitivity - ANSWER✔✔-remains constant
Assume that the absorption of 10 quanta of 50 nm by the eye of a rod chromomat results in vision. If the
wavelength was 450 nm, how many quanta would need to be absorbed to produce vision? -
ANSWER✔✔-10 quanta
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, Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024
One patient has a pupil diameter of 8 mm and another has a pupil diameter of 4mm. How much more
light reaches the retina of the eye with the larger pupil (compared to the eye with the smaller)? -
ANSWER✔✔-4x
Appropriate units for luminous power, illuminancec, and luminance are, respectively - ANSWER✔✔-
lumens, foot-candles, foot-lamberts
You are asked to measure the lighting conditions in a classroom to determine if they are adequate. The
lighting conditions should be specified in which units? - ANSWER✔✔-lumens/m^2
When measured at an angle of 30 degrees to its surface, a matte surface with a reflectance factor of 0.70
has a luminance of 50 foot-lamberts. What is the luminance when measured perpendicular to the
surface? - ANSWER✔✔-50 foot-lamberts
A subject views two patches of light. One patch consists of an additive mixture of 475 and 510 nm, and
the other patch consists of an additive mixture of 490 and 520 nm. By adjusting the intensities of each of
the wavelengths that constitute these patches, the subject is able to perfectly match the two patches.
The subject's vision is - ANSWER✔✔-could be monochromatic, dichromatic, or trichromatic
The cone photopigment that evolved most recently is probably - ANSWER✔✔-chlorolabe
An isoluminant grating used in a clinical test consists of red and green bars. Compared to the red bars,
the green bars have - ANSWER✔✔-less radiance
Which of the following is not a perceptual attribute of color: hue, colormetric purity, or saturation? -
ANSWER✔✔-colormetric purity
The colormetric purity of a monochromatic patch of 440 nm is closest to which of the following: 1.00,
0.75, 0.50, 0.25, 0.00? - ANSWER✔✔-1.00
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Vis Perc Practice Exam Questions with
Correct Answers
What percentage of the eye's refractive power is provided by the cornea? - ANSWER✔✔-67%
The nonphotosensitive pigment that coveres the surface of the macula lutea may protect this tissue by
absorbing - ANSWER✔✔-blue light
The thickness of the retina is - ANSWER✔✔-0.20 mm
Excessive exposure to UVC is most often associated with inflammation of the - ANSWER✔✔-cornea
A rod monochromat views the following four patches of monochromatic light: 440 nm, 510 n, 555 nm,
and 565 nm. Each patch produces 20 quantal absorptions. Which is brightest? - ANSWER✔✔-510 nm
Threshold contrast, under photopic conditions, is closest to - ANSWER✔✔-0.010
To optimize the rod-cone break of the dark adaptation curve for clinical testing, the stimulus should be -
ANSWER✔✔-5.0 degree diameter and green
Consider the region of the light adaptation curve that follows Weber's law. As the background intensity
decreases, contrast sensitivity - ANSWER✔✔-remains constant
Assume that the absorption of 10 quanta of 50 nm by the eye of a rod chromomat results in vision. If the
wavelength was 450 nm, how many quanta would need to be absorbed to produce vision? -
ANSWER✔✔-10 quanta
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, Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024
One patient has a pupil diameter of 8 mm and another has a pupil diameter of 4mm. How much more
light reaches the retina of the eye with the larger pupil (compared to the eye with the smaller)? -
ANSWER✔✔-4x
Appropriate units for luminous power, illuminancec, and luminance are, respectively - ANSWER✔✔-
lumens, foot-candles, foot-lamberts
You are asked to measure the lighting conditions in a classroom to determine if they are adequate. The
lighting conditions should be specified in which units? - ANSWER✔✔-lumens/m^2
When measured at an angle of 30 degrees to its surface, a matte surface with a reflectance factor of 0.70
has a luminance of 50 foot-lamberts. What is the luminance when measured perpendicular to the
surface? - ANSWER✔✔-50 foot-lamberts
A subject views two patches of light. One patch consists of an additive mixture of 475 and 510 nm, and
the other patch consists of an additive mixture of 490 and 520 nm. By adjusting the intensities of each of
the wavelengths that constitute these patches, the subject is able to perfectly match the two patches.
The subject's vision is - ANSWER✔✔-could be monochromatic, dichromatic, or trichromatic
The cone photopigment that evolved most recently is probably - ANSWER✔✔-chlorolabe
An isoluminant grating used in a clinical test consists of red and green bars. Compared to the red bars,
the green bars have - ANSWER✔✔-less radiance
Which of the following is not a perceptual attribute of color: hue, colormetric purity, or saturation? -
ANSWER✔✔-colormetric purity
The colormetric purity of a monochromatic patch of 440 nm is closest to which of the following: 1.00,
0.75, 0.50, 0.25, 0.00? - ANSWER✔✔-1.00
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