Quote: JerryChicken "Can I just throw three pennoth in ?
Humans have a field of vision that is ALMOST 180 degrees, get someone to test yours, its actually quite surprising what you can see to the side of you, I already know what both of my eyes are like for field of vision because I have it tested by my doctor every six months, but a simple test such as getting someone to approach from behind and then holding your hand up when you can see then should surprise you.
Further to that, your vision is also alerted more by moving objects, its an animal instinct sort of thing.'"
It is, and it's not just your "vision", as such; what happens is that such messages from your eyes, as well as going to the part of your brain that gives you pictures, also go DIRECT to your brain's "fight and flight" centre so that picks up sudden movements first; that is, we are made so that any sudden movement is picked up by the fight/flight system BEFORE you "see" it, so you can react to it quicker, and so that the dedicated self-preservation centre of your brain gets its own dedicated signal so it can decide how you react to it. Otherwise, you would have to wait until your visual cortex had worked out what it was seeing, and worked out a plan to deal with it.
Was a brilliant documentary about this a few months back. They discovered that a person who after brain surgery, no longer had any physical sight in one eye, (but still a working eye, just nowhere to send the visual signals to) could still "know" when objects moved across a computer screen. It turned out that he just "knew" when something moved across the screen as it was immediately detected in the f&F centre.
Quote: JerryChicken "So, a moped approaching your car from behind won't be visible to you yet, but if you turn your head even just slightly then your 180 degree field should pick them up easily, especially if they are deviating from a static location in relation to your eye, in other words they are pulling out to overtake and moving across you field of vision.'"
Agreed, if there is appreciable relative movement. But bear in mind they may just be keeping pace with you and thus not "moving" relative to you, so not as easy to pick up as a moving object.
Quote: JerryChicken "What we really need is an almost 360 degree field like some birds do.'"
Aye, I often think Mrs. A. has got eyes in the back of her head!
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