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CHAPTER 3 VISUAL SYSTEM, between, constricting the pupils, but with no…

- - - - behaves like waves
      - sometimes light defines as waves.
        
        electromagnetic energy
      - human eyes
        
        detect electromagnetic radiation
        
        length range of 380 and 780 nanometers
- - - - human cant because its too long to see
        
        in what for us a complete darkness
      - they see warm blooded pray
  - - - the Brightness
      - can make light, with any length.
        Make it more or less intense by making it brighter or dimmer
    - - direct related to energy of the light
      - shorter in wavelength are higher energy
        longer in wavelength are lower energy
      - its why ultraviolet, x-ray, gamma ray - harmful
        
        cause sunburns, cancer
        
        radio waves and infrared - no big deal
      - color is wavelength
- - - - light entering the retinas - regulated by donut-shaped bands
      - bands of Contractile tissue
      - the IRIS gives, our eyes characteristic color
    - - in response to changes in illumination represent, compromise
    - - HIGH - visual takes advantage of the situation by
      - LOW - too low to adequately active the receptor
        
        pupils - dilate (to let in more light)
        
        sacrifice acuity and depth of focus
        
        behind pupils - lens
        
        focus incoming light on the retina
        
        when direct our gaze at something near
        
        tension on the ligament hold each other lens in place.
        
        holding lens in place, adjusted by the ciliary muscle,
        
        the lens assumes, its natural cylindrical shape