The Back of the Eye: Structures and Functions
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Questions and Answers

What is the function of the cornea in the human eye?

  • To focus light rays onto the lens
  • To refract light rays so that they are focused on the lens (correct)
  • To sense the light intensity
  • To detect colors and details

    • What is the purpose of the pupil in the human eye?

  • To refract light rays
  • To allow light rays to enter the eye (correct)
  • To focus light rays onto the lens
  • To detect colors and details

    • What is the function of the lens in the human eye?

  • To sense the light intensity
  • To refract light rays
  • To focus light rays onto the retina (correct)
  • To detect colors and details

    • What is the function of the retina in the human eye?

    <p>To sense the light intensity and convert it into a signal</p> Signup and view all the answers

    What is the meaning of the Greek prefix 'photo-' in the context of the human eye?

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

    What is the function of the retina in the human eye?

    <p>To convert light into electrical impulses</p> Signup and view all the answers

    What is unique about the eyes of birds, amphibians, reptiles, and fish?

    <p>They have four different types of cones</p> Signup and view all the answers

    What is the function of rods in the human eye?

    <p>To allow humans to see images in black and white or shades of gray in low light levels</p> Signup and view all the answers

    Where are rods located in the eye?

    <p>In the peripheral part of the retina, increasing in density with distance from the fovea</p> Signup and view all the answers

    What is the approximate number of rods in a single retina?

    <p>120-130 million</p> Signup and view all the answers

    What is the primary function of cones in the human eye?

    <p>To perceive colors</p> Signup and view all the answers

    What is the difference between trichromatic and dichromatic vision?

    <p>Trichromatic vision involves three types of cones, while dichromatic vision involves only two</p> Signup and view all the answers

    Where are cones mainly located in the human eye?

    <p>In the center of the retina, in the macula</p> Signup and view all the answers

    What is the approximate ratio of rods to cones in the human retina?

    <p>20:1</p> Signup and view all the answers

    What is the unique feature of the fovea in the human eye?

    <p>It has a very large concentration of cones</p> Signup and view all the answers

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