SENSORY RECEPTORS

• What are the layers of the eyeball?

  • Sclera: tough outer coat; white of the eye
  • Choroid: pigmented vascular layer
  • Retina: innermost layer
• What is the function of the sclera?


  It is the tough outer coat of the eye
• What is the function of the choroid?

  It prevents scattering of light
• What are rods and cones in the retina responsible for?

  Rods are for night vision, and cones are for day vision and color vision
• What is the conjunctiva?

  A mucous membrane covering the front surface of the sclera and lining the eyelids
• What is conjunctivitis?


  Inflammation of the conjunctiva caused by allergic reactions
• What is the function of the lens in the eye?

  It focuses/refracts light rays on the retina
• What are some common disorders of the eyes?

  • Astigmatism: unequal focusing of light rays
  • Blindness: partial loss or lack of vision
  • Cataract: cloudiness of the lens
  • Color blindness: inability to perceive certain colors
  • Farsightedness (hyperopia): blurred vision due to incorrect focusing behind the retina
  • Nearsightedness (myopia): blurred vision due to incorrect focusing in front of the retina
  • Glaucoma: high intraocular pressure
  • Retinoblastoma: cancer of immature retinal cells
  • Strabismus: eyes not directed toward the same object simultaneously
• What is astigmatism?

  Unequal focusing of light rays on the retina, causing part of the image to be blurry
• What is blindness?


  Partial loss or lack of vision
• What is a cataract?


  Cloudiness/opacity of the lens which impairs or prevents vision
• What is color blindness?


  Inability to perceive certain colors or, more rarely, all colors
• What is farsightedness (hyperopia)?

  Blurred vision caused by light rays being incorrectly focused behind the retina
• What is nearsightedness (myopia)?

  Blurred vision caused by light rays being incorrectly focused in front of the retina
• What is glaucoma?


  A condition in which aqueous humor is produced more rapidly than it is removed, resulting in high intraocular pressure
• What is retinoblastoma?

  A cancer of immature retinal cells
• What is strabismus?


  A disorder of the extrinsic eye muscles in which the eyes are not directed toward the same object simultaneously
• IDENTIFY THE ENDOCRINE GLANDS

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