Andy Champ wrote:
On 18/12/2011 05:12, John Legon wrote:
As I recall, opticians use coloured targets (red and blue discs?) to
test for marginal focussing of the eyes.

Red & green. The number of sensors in the back of the eye is much lower
for blue, we don't have such good resolution.

Andy
My eyes won't focus the blue from blue LEDs properly. They are always
blurred.

Bill

On Wed, 30 Nov 2011 19:13:35 +0000, Adrian C
wrote:


http://www.julianbeever.net/pave.htm

These are known as 'Anamorphic illusions' and can be viewed without
special glasses and other paraphernalia.

Some joker like him had drawn an extremely realistic ragged hole in a
pavement, as if it had collapsed into a sewer.
It was amusing standing on the other side of the road watching people
stop and skip around it, then realise what it was.

On Thu, 01 Dec 2011 09:14:23 +0000, Pete Shew
wrote:

Just try keeping one eye closed whilst driving to see if has an effect.
It does for me (I did the experiment to see if I could experience the
problems of a one-eyed person particularly as I know a one-eyed pilot)

I knew one of those - careful enough when it came to flying, but a
dangerous ******* otherwise.

On Sun, 18 Dec 2011 17:27:47 +0000, Bill Wright
wrote:

Andy Champ wrote:
On 18/12/2011 05:12, John Legon wrote:
As I recall, opticians use coloured targets (red and blue discs?) to
test for marginal focussing of the eyes.

Red & green. The number of sensors in the back of the eye is much lower
for blue, we don't have such good resolution.

Andy
My eyes won't focus the blue from blue LEDs properly. They are always
blurred.

Bill

They are blurred as they are large for the luminance output and small
for the chrominance and so look faint away from the centre. (I think!)

Steve

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Pete Shew wrote:

Just try keeping one eye closed whilst driving to see if has an effect.
It does for me (I did the experiment to see if I could experience the
problems of a one-eyed person particularly as I know a one-eyed pilot)

WARNING: be sure that you are safe when starting and be ready to use
both eyes if a situation develops - goes without saying really.

When diving, you probably rely mostly on motion parallax anyway.