15 Questions
Which part of the retina has the highest concentration of cones?
The fovea
What is the main difference in rod and cone distribution across the retina?
There are more cones than rods in the peripheral retina
What is the visual consequence of the differences in rod and cone distribution across the retina?
Increased spatial sensitivity on the central retina
What is the fovea's structural specialization that maximizes visual acuity?
Lateral displacement of cells
What happens to visual acuity when looking slightly away from a test chart?
Visual acuity decreases
Why are we poorer at discriminating colors on our peripheral retina?
There are fewer cones in the peripheral retina
What is the function of the macula?
To maximize visual acuity
Which type of photoreceptor is primarily responsible for our ability to see in low light conditions?
Rods
What is the consequence of rod and cone distribution differences at dim scotopic light levels?
Our peripheral vision becomes blind
How can you demonstrate the greater sensitivity of your peripheral retina on a starry night?
Move your eyes to look at a dim star
Why do objects tend to look dark blue-green at scotopic light levels?
Because rods are more sensitive to blue-green light
What allows us to perceive some color at night in densely populated areas?
The activation of cones by streetlights and neon signs
What is the basis for differing points of view about the design of automobile dashboard indicator lights?
The spectral sensitivity of the rods
Where are cones primarily found in the retina?
In the central fovea
What makes the peripheral retina better at detecting dim light?
The many photoreceptors providing input to a ganglion cell
Test your knowledge on regional differences in retinal structure and their visual consequences. Learn about the varying distribution of rods and cones in different parts of the retina, and how these differences impact our vision.
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