Date: Sat, 29 Oct 2011 22:25:02

Author: --- Paul Nord

Subject: Re: Optical Trick - can someone explain?


Yes Chuck. But why does a drop of water and a distant point source make them so visible?

On Oct 29, 2011, at 10:13 PM, chuck britton wrote:

> I have been amused/entertained my my floaters at least since the first grade. (Extremely near sighted if that makes a difference.)
> My understanding has always been that they are 'loose' cells floating in the vitreous humor just in front of the retina, casting a shadow thereon. Sometimes form strings of cells.
> .
> At 10:20 AM -0500 10/29/11, Paul Nord wrote:
>> The other evening my kids discovered a curious thing. If you look through a drop of water on your glasses at a distant light source you will see an array of curious objects floating around. I tried it myself and discovered that you always get the same set of floaters - different drop, different spot on the glasses, same floaters. It would seem that the floaters must be inside the eye, or possibly on the surface of the eye.
>> Can anyone have a good quick explanation of the optics involved here?
>> Paul