Eye blinks and retinal images

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Don W - 29 May 2005 20:44 GMT

If one blinks the eye rapidly, an image is sometimes produced and
transmitted to the retina. Has this phenomenon been studied anywhere?

Thanks.

Don W

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Mike Tyner - 29 May 2005 22:14 GMT

"Don W" <dwilgus@prodigy.net> wrote\
\

> If one blinks the eye rapidly, an image is sometimes produced and
> transmitted to the retina. Has this phenomenon been studied anywhere?

What "image" are you describing?

I see blood vessels. That's called "Purkinje's tree" because Purkinje
explained it about 200 years ago.

-MT

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Don W - 30 May 2005 17:27 GMT

Mike, not talking about reflective light off the inside of the eyeball.
What I meant is that when the eyelid blinks (and this is done rapidly for
awhile) there is a faint extra pressure that is exerted onto the front of
the eye. And that pressure is transmitted to the retina. I am speculating
that if there are retinal abnormalities that this might make them more
discernable.

Don W

> "Don W" <dwilgus@prodigy.net> wrote\
> \
[quoted text clipped - 7 lines]
>
> -MT

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Mike Tyner - 30 May 2005 17:42 GMT

> Mike, not talking about reflective light off the inside of the eyeball.
> What I meant is that when the eyelid blinks (and this is done rapidly for
> awhile) there is a faint extra pressure that is exerted onto the front of
> the eye. And that pressure is transmitted to the retina. I am
> speculating that if there are retinal abnormalities that this might make
> them more discernable.

I'm familiar with the geometric patterns that appear when you press hard on
your eyes and it also occurs when you're exposed to bright stroboscopic
light. It happens in the brain, a symptom of "overload," not necessarily due
to pressure.

I don't think it would have any diagnostic significance but it isn't
impossible.

-MT

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