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Protective Structures of the Eye
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Protective Structures of the Eye

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Questions and Answers

Which structure provides a passage for lacrimal fluid from the lacrimal sac to the nasal cavity?

  • Meibomian glands
  • Ciliary glands
  • Nasolacrimal duct (correct)
  • Lacrimal canals
  • What is the function of the conjunctiva in the eye?

  • Producing tears
  • Secreting mucus (correct)
  • Producing antibodies
  • Protecting the eye
  • Where are the lacrimal glands located in relation to the eye?

  • Below the lateral end of the eye
  • Above the lateral end of the eye (correct)
  • Below the medial end of the eye
  • Above the medial end of the eye
  • What is the primary purpose of the lacrimal apparatus in the eye?

    <p>Protect, moisten, and lubricate the eye</p> Signup and view all the answers

    Which of the following structures produces an oily secretion to lubricate the eye?

    <p>Meibomian glands</p> Signup and view all the answers

    How many extrinsic or external eye muscles are responsible for eye movements according to the text?

    <p>6</p> Signup and view all the answers

    What is the function of rhodopsin in the rods?

    <p>Absorb photons</p> Signup and view all the answers

    Why are cones activated by much brighter light compared to rods?

    <p>Cones require many more photons for activation</p> Signup and view all the answers

    What happens when photoreceptor proteins are activated by light?

    <p>They change shape</p> Signup and view all the answers

    Where does the signal go after reaching the inner end of rods and cones?

    <p>Sets of neural cells</p> Signup and view all the answers

    What is the role of charged ions in the cells during the visual signal process?

    <p>Initiate the action potential</p> Signup and view all the answers

    How does the optic nerve transmit visual information to the brain?

    <p>Through rhodopsin activation</p> Signup and view all the answers

    What is the outermost layer of the eyeball called?

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

    Which eye structure allows for light to pass through and is the most exposed part of the eye?

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

    What is the main function of the Iris in the eye?

    <p>Regulate amount of light entering the eye</p> Signup and view all the answers

    Which layer of the eye contains dark pigment to prevent light scattering inside?

    <p>Ciliary body</p> Signup and view all the answers

    In what conditions do the muscles of the eye contract to enlarge (dilate) the pupil?

    <p>Distant vision and dim light</p> Signup and view all the answers

    Which part of the eye acts like the diaphragm of a camera?

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

    What is the function of the vitreous humor in the eye?

    <p>Helps keep the eyeball from collapsing inward</p> Signup and view all the answers

    Where is the canal of Schlemm located?

    <p>At the junction of the sclera and cornea</p> Signup and view all the answers

    What is the primary function of the aqueous humor?

    <p>Provides nutrients for the lens and cornea</p> Signup and view all the answers

    Which segment of the eye lasts a lifetime and is not replaced?

    <p>Posterior segment</p> Signup and view all the answers

    Why must the lens change its shape to focus on closer objects?

    <p>To ensure light is focused to a point on the retina</p> Signup and view all the answers

    What happens to the image formed on the retina as a result of the lens activity?

    <p>It is reversed from left to right, upside down, and smaller than the object</p> Signup and view all the answers

    What is the correct term for the condition where near objects appear clear, but objects farther away look blurry?

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

    What causes hyperopia, or farsightedness?

    <p>Eyeball being too short</p> Signup and view all the answers

    In which condition are images focused as lines instead of points?

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

    What is the visual acuity problem that results from the decreasing elasticity of the lens with aging?

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

    Which type of corrective lenses are used to treat myopia?

    <p>Concave lenses</p> Signup and view all the answers

    What is the correct term for harmonious vision where images are correctly focused on the retina?

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

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