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