Chapter 50
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Questions and Answers

Which structure in the eye is responsible for the highest visual acuity?

  • Lens
  • Retina (correct)
  • Ciliary muscle
  • Optic disc
  • What is the purpose of the optic disc in the eye?

  • To provide entry point for retinal blood vessels (correct)
  • To refract light rays
  • To connect the ciliary muscle with the lens
  • To fill the anterior and posterior chambers
  • What is the refractive index (R.I.)?

  • The degree of refraction
  • The speed of light in air
  • The ratio of speed of light in air to speed of light in a substance (correct)
  • The speed of light in a transparent substance
  • Which of the following structures in the eye has the most refractive power?

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

    What happens to light rays when passing through an angulated interface with a different refractive index?

    <p>They bend more</p> Signup and view all the answers

    What is the purpose of the suspensory fibers in the eye?

    <p>To connect the ciliary muscle with the lens</p> Signup and view all the answers

    Which layer of the eye contains the photosensitive cells?

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

    What is the purpose of the vascular layer in the eye?

    <p>To provide entry point for retinal blood vessels</p> Signup and view all the answers

    What is the purpose of the suspensory fibers in the eye?

    <p>To connect the ciliary muscle with the lens</p> Signup and view all the answers

    What type of lens focuses light rays?

    <p>Convex lens</p> Signup and view all the answers

    Which is the main determinant of the level of pressure in the eye?

    <p>Resistance to outflow of aqueous humor</p> Signup and view all the answers

    What is the risk factor for glaucoma?

    <p>Systemic hypertension</p> Signup and view all the answers

    What can increased pressure in the eye cause?

    <p>Compression of blood vessels</p> Signup and view all the answers

    Which type of glaucoma is the most common in the U.S.?

    <p>Open angle glaucoma</p> Signup and view all the answers

    What is the main cause of reduced flow through trabecular meshwork in glaucoma?

    <p>Deposition of fibrous material</p> Signup and view all the answers

    Which type of glaucoma is considered a medical emergency?

    <p>Closed angle glaucoma</p> Signup and view all the answers

    What is the treatment for closed angle glaucoma?

    <p>Laser peripheral iridotomy</p> Signup and view all the answers

    Which medication decreases the production of intraocular fluid?

    <p>Beta blockers</p> Signup and view all the answers

    Which medication increases the outflow of fluid from the eye?

    <p>Prostaglandin analogs</p> Signup and view all the answers

    Which medication decreases fluid production and increases drainage?

    <p>Alpha agonists</p> Signup and view all the answers

    Which part of the eye has the highest refractive power?

    <p>Anterior surface of the cornea</p> Signup and view all the answers

    What is the measure of the power of a lens?

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

    What is the total refractive power of the eye?

    <p>59 diopters</p> Signup and view all the answers

    What is the term for the ability of the lens to increase its refractive power?

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

    What is the condition called when the lens gets harder and less flexible with age?

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

    What is the term for unequal focusing of light rays due to an oblong shape of the cornea?

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

    What is the term for farsightedness caused by a short eyeball or sometimes a weak lens?

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

    What is the term for nearsightedness caused by a long eyeball or sometimes too much refractive power in the lens system?

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

    What is the leading cause of blindness worldwide?

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

    What is the term for the ability to see letters of a given size at 20 feet, which is considered normal vision?

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

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