Vision lab review
20/40 vision means you can read 40% of #20 letters on a Snellen eye chart.
false
Why is vision lost when light hits the blind spot?
The area lacks photoreceptors
Why is each eye tested separately when using the Snellen eye chart?
Visual acuity is different in each eye
ability to focus for close (under 20 ft) vision
accomadation
Presbyopia is
age-related close vision problems due to inelasticity of lens
blurred vision due to unequal curvatures of the lens or cornea
astigmatism
To which wavelengths of light do the three cone types of the human retina respond maximally? (choose all that apply)
blue, red and green
medial movement of the eyes during focusing on close objects
convergence
normal vision
emmetropia
inability to focus well on close objects (farsightedness)
hyperopia
You would expect the pupil to be dilated in which of the following circumstances? (choose all that apply)
in dimly lit surroundings in observing distant objects
What is the usual cause of color blindness?
lack of one or more of the cone types ?
nearsightedness
myopia
light bending
refraction
The dim light receptors are the____and the bright light receptors are the ______.
rods; cones
20/10 vision means you can read letters at 20 feet that "normal" eyes read at 10 feet.
true
Astigmatism is blurry vision due to unequal curvature of the lens or cornea.
true
Depth perception is the main advantage gained from binocular vision.
true
Which of the following vitamins is important for vision? (choose all that apply)
vitamin A
When more than one type of cone is stimulated,
we perceive colors intermediate to red, green, or blue.