Schematic Eye Models in Primary Eye and Vision Care
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Questions and Answers

What is the index of the tear layer?

  • 1.416
  • 1.376
  • 1.400
  • 1.336 (correct)
  • What percentage of refraction occurs in the cornea?

  • 1/2
  • 3/4
  • 1/3
  • 2/3 (correct)
  • What is the process by which the crystalline lens varies its focal length?

  • Diffraction
  • Accommodation (correct)
  • Refraction
  • Reflection
  • What is the term for the distance between the focus and the retina when the accommodation is insufficient?

    <p>Lag of accommodation</p> Signup and view all the answers

    In which refractive status is the image exactly in front of the retina?

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

    What is the average power of the cornea in diopters?

    <p>43.00-44.00 D</p> Signup and view all the answers

    What is the purpose of a schematic eye model?

    <p>To represent the basic optical features of the real eye</p> Signup and view all the answers

    Which scientist is credited with making a six-surface eye model?

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

    In Gullstrand's schematic eye, what is the refractive power of the unaccommodated lens?

    <p>43.05 D</p> Signup and view all the answers

    What is the refractive index of the cortex of the crystalline lens in Gullstrand's schematic eye?

    <p>1.386</p> Signup and view all the answers

    What is the radius of curvature of the lens in Gullstrand's schematic eye at the back surface?

    <p>6.0 mm</p> Signup and view all the answers

    Which distance in Gullstrand's schematic eye is 3.6 mm?

    <p>Distance from corneal apex to front lens surface</p> Signup and view all the answers

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