Re: This may be the wrong place to ask...

What you are describing sounds to me like what some people call floaters. Floaters are usually located inside of your eye, and can cross your visual spectrum and become visible to you. Often they are more visible after a sudden change of light, so a flash or blip of light on a smooth surface could certainly do the trick. You aren't crazy, or smoking anything. The reason others may not have made the connection to what you describe is because you connect it with physical objects. However, if you have one of those episodes again, immediately close your eyes and turn towards a light source. If you can still see the object, then you definitely have floaters. There is a forum here on curezone for floaters, it may answer more of your questions, and either help verify or nullify the likelihood that you have floaters, or are describing something else entirely.

By the way, floaters are real material located within the vitreous fluid of the eye. It may be microorganisms or clumps(nearly microscopic clumps) of cells that have not been able to be moved efficiently out of the eye. Nutrient deficiencies, protein buildup, and microbes of one type of another can be the cause.

I'm attaching just a few sites that address this issue. Hopefully, they will help to ease your mind, or recognize if the floaters are a real cause for concern for you.

http://www.allaboutvision.com/conditions/spotsfloats.htm

http://www.ctds.info/eye-floaters.html

http://www.irishhealth.com/index.html?level=4&con=492

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