1. Chapter 2 HUMAN FACTOR

  1. Cornea controls focusing of eye from 70 to 80 %
  2. Iris controls quantity of light entering eye
  3. Luminicence level 5 times
  4. Light enters eye through cornea
  5. Eye makes 3 dimensional picture
  6. Hypermetropia longsightedness
  7. Myopia short sightedness
  8. Longsightedness eye ball is shorter than normal
  9. Shortsightedness eyeball is longer than normal
  10. Longsightedness use convex lens
  11. For short sightedness use concave lens
  12. In longsightedness images is formed behing retina
  13. in shortsightedness image is formed in front of retina
  14. Astigmatism is when mishapen cornea
  15. Astigmatism irregular shape appear
  16. Colour blindness normally red and green
  17. Colour blindness rare cases blue and yellow
  18. Colour blindness in men 8 percent
  19. Colour blindness in women 0.5 percent
  20. A/c insp by eye / visual 80 percent
  21. Easy reading 2
  22. Legability ....> font size, space between words and capital letters
  23. Typography.....> page layout, colour coding , under line and spacing
  24. Understanding ....> Goood writing styles
  25. Ear hearing range 20 to 20 000Hz
  26. Volume measured in decibells
  27. Awareness threshold volume level is 0 db
  28. Noise ...which is unpleasant and not clear
  29. Sound enters ear through audiotry canal and hit ear drum
  30. Cochlea behing stirrup .It contains liquid and hairs and Transforms vibration into electro chemical signals
  31. Ear protection used on ....... more than 90 db
  32. and .....................................85 db on more than 4 hrs
  33. Presbycusis is hearing problem due to aging
  34. During shift change comm is person to person
  35. Visual info storage time.....1/2 sec
  36. Hearing info storage time ........2 sec
  37. Concentration of specific elements....... Attention
  38. Monitoring saveral sources.......Selective Attention
  39. Checking out only one source.........Focused attention
  40. Performing two or more tasks simultaneously is ...........Divided attention
  41. Maintaing attention over a long period of time is .....Sustained Attention
  42. Highly sophisticated mechnism that require existing knowledge and experience is .......Perception
  43. Memory types are.........3
  44. Ultra short.............sensory memory.......2 sec
  45. Shortterm....Working memory ....5 to 9 items.......10 to 20 sec
  46. Long term memory ........2 types Semantic , Episodic
  47. Semantic .............Factual knowledge, beliefs, rules
  48. Episodic ............specific events..................past experience
  49. Input to memory ............Registration
  50. Retention.......................Storage
  51. Recovery.......................Retrieval
  52. abnormal fear in an enclosed space............claustrophobia

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