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Structure and function of eye

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eye, external and internal structure, brief structure of eye parts

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Structure and function of eye

  1. 1.  Gift of the Creator Gives us the sense of sight 70% of all sensory receptors are in the eye Spheroid structure, about 2/3 the size of aping-pong ball Functions: distinguishes light and dark,shape, colour, brightness & distance ofobjects.
  2. 2.  Includes : bony orbit, eyelids, eyelashes,tears and fat glands, extra ocularmuscles, conjunctiva
  3. 3.  Most of the eye is enclosed in a bony orbit Structure:o Cheekboneo Foreheado Templeo Side of nose Function:Provides protection to the eye
  4. 4.  A thin fold of skin that covers the eye Protect eye from foreign matter (dust, dirt, debris) Protect against bright light that might damage theeye Lubricate the eye surface by distributing tears overthe corneaUppereyelidLower eyelid
  5. 5.  Are the hairs that growat the edge of eyelids Protect the eye byfiltering out foreignmatter
  6. 6.  A thin, clear layer of skin Lines the inner surface of eyelids &covers the front surface of the eyeball except the cornea Secretes mucus to lubricate the eye Keeps bacteria and foreignmaterial from getting behind eye
  7. 7.  Innermost, sensitive layer of the eye A delicate membrane containingphotoreceptors & associatedneurons
  8. 8. Are of two main kinds:RodsCones
  9. 9.  Sensitive to dim light Present everywhere in the retinaexcept the fovea Allow dim light vision & peripheralvision 125 million rods in the averageretina
  10. 10.  Sensitive to bright light Clustered near the centre ofretina(fovea) Distinguish colours & allowsharp vision 5 million cones in the averageretina
  11. 11.  A depression in the retina directly oppositeto lens
  12. 12.  Contains only cones & no rods Function: to form an extremely clearimage Is directed towards whatever objectyou are studying most closely
  13. 13.  A point where the optic nerve enters retinaOptic discOptic nerve
  14. 14.  absence of cones & rodsat the optic disc No vision is possible here Referred to as blind spot
  15. 15. The bundle of overone billion nervefibres that carryvisual messagesfrom the retina tothe brain.
  16. 16.  Arteries transmit oxygen& nutrients Veins carry deoxygenatedblood from the eye
  17. 17.  Transforms light energy toelectrical signals
  18. 18. AnteriorChamberPosteriorChamber
  19. 19.  A clear, watery fluid in the anteriorchamber Nourishes the lens & cornea and helpsrefract light onto the retina
  20. 20.  A clear, gel-like fluid in the posteriorchamber Supports the lens & retina and keepsthe eye from collapsing Aids the magnifying power of the eye
  21. 21.  Light rays coming from object enterthrough the cornea, progress throughpupil & fall on eye lens which convertslight rays & produces a real & invertedimage of object on retina. The imagethus formed is conveyed to brain by opticnerve in the form of electrical signalswhich are seen by the brain as a visualimage.

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