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A Keen Eye (Structure of the eye (Retina ( images are projected) (3 major…

- - - - photoreceptors
        
        rods-scotopic vision + rhodopsin
        
        cones- photopic vision + iodopsin&photopsin
        
        when exposed to light they get hyperpolorized -->stimulation ob bipolar anf ginglion cells
      - bipolar cells
        
        connection between the outer and inner layer
      - ganglion cells
    - - reduces the amount of reflected light
    - - permits the light to pass through the retina twice
- - - - congenital-->caused by disease
      - secondary--> by injury
      - traumatic-->by old age
      - senile/ presbyopia-->the lens gets less
        elastic
  - - - neovascularization-->capillaries swell and new abnormal blood vessels are formed
    - - leads to partial blindness depending on how big the detached area is
    - - retinitis pigmentosa--> losing vision at night and
        later results in blindness
  - - - opening between the iris and lens, pushing the iris up
    - - cuts of pressure of the circulation to the head of the optic nerve,
        which leads to blindness accompanied by pain
  - - - exomyopia-->eye ball too long
- - - - Bipolar cells fire less when the environment is inhibited which leads the ganglion cells to fire less
  - - - perception of the brightness or color of one area is affected
        by the presence of an adjacent or surrounding area