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Regional Differences in Retinal Structure and Vision

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Regional Differences in Retinal Structure and Vision

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Questions and Answers

Which part of the retina has the highest concentration of cones?

The macula

The central retina

The retinal periphery

The fovea (correct)

What is the main difference in rod and cone distribution across the retina?

There are no rods in the peripheral retina

There are more cones than rods in the peripheral retina (correct)

There are more rods than cones in the central fovea

There are no cones in the central fovea

What is the visual consequence of the differences in rod and cone distribution across the retina?

Increased visual acuity in the peripheral retina

Increased spatial sensitivity on the central retina (correct)

Improved color discrimination in the peripheral retina

Improved color discrimination on the central retina

What is the fovea's structural specialization that maximizes visual acuity?

Lateral displacement of cells (A) Signup and view all the answers

What happens to visual acuity when looking slightly away from a test chart?

Visual acuity decreases (C) Signup and view all the answers

Why are we poorer at discriminating colors on our peripheral retina?

There are fewer cones in the peripheral retina (D) Signup and view all the answers

What is the function of the macula?

To maximize visual acuity (B) Signup and view all the answers

Which type of photoreceptor is primarily responsible for our ability to see in low light conditions?

Rods (A) Signup and view all the answers

What is the consequence of rod and cone distribution differences at dim scotopic light levels?

Our peripheral vision becomes blind (B) Signup and view all the answers

How can you demonstrate the greater sensitivity of your peripheral retina on a starry night?

Move your eyes to look at a dim star (C) Signup and view all the answers

Why do objects tend to look dark blue-green at scotopic light levels?

Because rods are more sensitive to blue-green light (B) Signup and view all the answers

What allows us to perceive some color at night in densely populated areas?

The activation of cones by streetlights and neon signs (A) Signup and view all the answers

What is the basis for differing points of view about the design of automobile dashboard indicator lights?

The spectral sensitivity of the rods (A) Signup and view all the answers

Where are cones primarily found in the retina?

In the central fovea (A) Signup and view all the answers

What makes the peripheral retina better at detecting dim light?

The many photoreceptors providing input to a ganglion cell (A) Signup and view all the answers