The Eye and Sight

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The Eye and Sight

• pp. 242-252

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Process of Sight

• Light enters the eye and is bent or refracted by
  the cornea through the pupil.
• The light passes through the lens.
• This completes refraction by fine tuning the
  focused light onto the retina.
• The retina changes the light into electric
  impulses
• The impulse is carried through the optic nerve to
  the vision center of the brain where the image is
  interpreted.

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External Structures

• Conjunctiva lines eyelids
• secretes mucous
• Lacrimal glands at lateral end of eye
  secretes tears
• Nasolacrimal duct medial end of eye
• for drainage

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The Tunics of the Eyeball

• Sclera thick white layer
• Choroid blood rich, darkly pigmented area which
  prevents the scattering of light
• Retina contains rods and cones

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Other Eye Structures

• Cornea transparent window through which light
  enters
• Ciliary body muscular structure attached to the
  lens and iris

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• Aqueous Humor watery fluid that nourishes the
  interior of the front of the eye
• Vitreous Humor is the clear gel that fills the
  space between the lens and the retina of the
  eyeball