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Chapter 6

Chapter 6. Physical Aspects of Driving. Human Error. 90-95% of vehicle accidents are caused by people not vehicles or roadways. Vision Problems?. 90% of driving information is received through the eye Affects of a person’s vision: Genetics Fatigue Smoking Age Illness

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Chapter 6

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  1. Chapter 6 Physical Aspects of Driving

  2. Human Error • 90-95% of vehicle accidents are caused by people not vehicles or roadways.

  3. Vision Problems? • 90% of driving information is received through the eye • Affects of a person’s vision: • Genetics • Fatigue • Smoking • Age • Illness • Alcohol or other drugs

  4. Field of VisionThe area you can see looking straight ahead • Central vision- looking straight ahead-it’s the area where you see things clearly Fringe vision- outside central vision where you recognize objects but not clearly • Peripheral vision- outside of your field of vision where you see motion but not objects

  5. Field of Vision Affects • Tunnel vision caused by genetics • Other traffic blocking parts of your field of vision • Your vehicle’s design can block you vision • Illness, even temporary illness can cause vision restriction • Age can reduce a person’s field of vision

  6. Alcohol as a Sedative Affects many areas of the body from mental functions to relaxing muscles

  7. Ways Alcohol Sedates the Eyes • Slows the pupil, increasing glare and slow glare recovery • Relaxing the muscles that control the lens reducing visual acuity • Sedating the retina causing problem of color recognition especially shades of darkness while driving • Binocular vision: ability of the eyes to focus together on an object • Peripheral vision can be narrowed

  8. Other disabilities that may affect a person’s ability to drive includes: • Hearing loss- there is usually no increased risk because of visual compensationPhysically challenged persons are not normally a greater risk. Safe driving is a mental skill so physical limitations can usually be overcomeAge affects all of a person’s senses.

  9. Other disabilities continued • Epileptics are allowed to have a class c license if they are on medication and have gone seizure free for one year. • Diabetes is a major problem because of the serious effect of high or low sugar • Mental ability. The DMV officer can ask for medical referral if he/she suspects an individual’s mental ability may be a problem

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