Re: Ion blue lights - a test report

[Marty Halvorson <martyh@nm.net>]

At 23:52 16-04-98 -0500, Luis Marques wrote:
>Small eye trivia: the human eye has three different sensing cells; they are
>sentive to red, green, and blue light (that's where the old color monitor
>standard RGB came from).

That's not quite true.  There are 2 kinds, rods and cones, one is
monochromatic, low light level sensitive, the others are divided into the
three color sensitive types.  You can tell that this is old information in
my head because I can't remember whether it's rods or cones that are the
color sensitive cells.

The density of the cells varies also.  The color sensitive cells are mostly
near the center of the retina, the low light cells have a lower density,
and are mostly near the edges of the retina.  That's why you can see low
luminence objects (such as galaxies in the night sky) by averting your gaze.

Peace
Marty Halvorson