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?

    <p>Lateral displacement of cells</p> Signup and view all the answers

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

    <p>Visual acuity decreases</p> Signup and view all the answers

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

    <p>There are fewer cones in the peripheral retina</p> Signup and view all the answers

    What is the function of the macula?

    <p>To maximize visual acuity</p> Signup and view all the answers

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

    <p>Rods</p> Signup and view all the answers

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

    <p>Our peripheral vision becomes blind</p> Signup and view all the answers

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

    <p>Move your eyes to look at a dim star</p> Signup and view all the answers

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

    <p>Because rods are more sensitive to blue-green light</p> Signup and view all the answers

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

    <p>The activation of cones by streetlights and neon signs</p> Signup and view all the answers

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

    <p>The spectral sensitivity of the rods</p> Signup and view all the answers

    Where are cones primarily found in the retina?

    <p>In the central fovea</p> Signup and view all the answers

    What makes the peripheral retina better at detecting dim light?

    <p>The many photoreceptors providing input to a ganglion cell</p> Signup and view all the answers

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