Human eyes resolution

[energy80s]

this is a better more complete test for color blindness

http://www.toledo-bend.com/colorblind/Ishihara.html

or here http://members.aol.com/protanope/colorblindtest.html

Tried these, and it confirms that I am red / green colourblind.

[donpedro]

LEFT most image = the real image
The next three images are what YOU WOULD SEE if you HAD that particular type of colour blindness...

I think you are right.

BTW: Very interesting information here

[thayne]

NM

[donpedro]

So how do you explain seeing spikes on bicycle wheel rotating in oposit direction ?

[BJ_M]

simple(2 possable reasons) -- there is a man made made light source nearby which has a strobe effect of 50 or 60 cycles per sec (or an real strobe light) .. which causes a stop motion effect of the spokes .. since the wheel is not going exactly in sync with the strobe -- it will "appear" going backwards or forwards , changing the speed of the wheel (or changing your electrical freq. or strobe rate) will cause the wheel apparent speed to change ..

a nearby object can also cause this effect from reflection of one object to another at different speeds -- but the effect is the same (but not as noticable) ..


the other reason is a use of a shutter acting as a strobe - such as in film projection ..
In movies now days -- ussually wheel motion (going backwards) is not seen as much becuase everthing is so much animated and blue screened - that the stop motion effects are removed ..

[donpedro]

What about during daylight ? Try it

[g_shocker182]

simple(2 possable reasons) -- there is a man made made light source nearby which has a strobe effect of 50 or 60 cycles per sec (or an real strobe light) .. which causes a stop motion effect of the spokes .. since the wheel is not going exactly in sync with the strobe -- it will "appear" going backwards or forwards , changing the speed of the wheel (or changing your electrical freq. or strobe rate) will cause the wheel apparent speed to change ..

a nearby object can also cause this effect from reflection of one object to another at different speeds -- but the effect is the same (but not as noticable) ..


the other reason is a use of a shutter acting as a strobe - such as in film projection ..
In movies now days -- ussually wheel motion (going backwards) is not seen as much becuase everthing is so much animated and blue screened - that the stop motion effects are removed ..

and

Resolution refers to pixles, a digital image. We don't see in pixles so there is no resolution. We see in analog (waves), not digital (pixles).

..sound like the best explainations i've heard.

[vitualis]

What about during daylight ? Try it

There is probably still some strobing light source from somewhere (or some other source of regular flicking -- you don't have nystagmus or something do you?)

Regards.

[Gees]

Is it true only males can be colorblind? That's not a dig. :c) It's just what I'd heard and always wondered if it's factual.

[BJ_M]

no - females can be color blind also -- but it is rarer ..

my wife is color blind -- her father was also (just about totally - only saw in greys) , she is only partially but denys it ussually.

[Gees]

Ahh, thank you. :c)

[lordsmurf]

if fact human vision isnt all that hot (or smell or taste or touch or electrical simulation (if we were sharks or other creatures)) .. well we can make up for it in other things i guess ...

We enjoy sex.

Most animals don't. That MORE THAN makes up for the bad vision, taste, etc.

[donpedro]

Try this one from http://www.skytopia.com/project/illusion/illusion.html

Magic Zoomster
This cool optical illusion has been seen before, but I've spruced it up by adding colour, multiple layers, and making it bigger!! The idea is to focus on the dot in the centre and then move your head constantly towards and away from the monitor. You should see the circles rotate spookily! Press the F11 key in your browser to see the illusion at full screen!

A Bulge
Also created by Akiyoshi, the lines in this picture below are completely parallel would you believe?

[vitualis]

Is it true only males can be colorblind? That's not a dig. :c) It's just what I'd heard and always wondered if it's factual.

Both males and females can be colour blind.

The most common form of colour blindness is red-green. The particularly gene that this is carried on is on the X chromosome (sex-linked recessive).

Since males only have one X chromosome (the other being a Y), if you get an X chromosome that has the gene, you will have red-green colourblindness.

Females have two X chromosomes. Since it is a recessive gene, if she has the normal gene on the other X chromosome, she will still have normal colour vision. For her to get this particular form of red-green colour blindness, she will need to have the gene on BOTH (much rarer).

Regards.