Emergency spectacles

[watervole]

This is fun, and it works - I just tried it.  (the practical value may be limited, but I can actually read text that I can't otherwise read without my glasses)

A good one if you ever want to show the kids some instant science.

Comments

[waveney.livejournal.com]

With a pin hole, is the only way I can focus on anything with my left eye.

(It has a type of cataract that is clear, but stops parts of the lens flexing, thus I end up normally with 3+ overlapping, non aligned fuzzy images which is why I don't use it, the pin hole leaves me with one image...)

[the-magician.livejournal.com]

I've used that idea of putting fingers together (though I have a one handed way of doing it) to get enough focus to look for my glasses when I've had them fall off the bedside table and "out of sight" a few times in the past

And the pinhole sunglasses were one of the things I think Tomorrow's World mentioned years ago as eye trainers as they allowed you to see but also encouraged your eye muscles to work to help keep them healthy and better able to focus on things (though those of us with astigmatism need more than strong eye muscles!)

http://www.jdharris.co.uk/product_info.php?pName=pinhole-glasses

[pennski.livejournal.com]

Oh wow! I just did the fingers version and it worked.

[watervole.livejournal.com]

Actually, no. It's a totally different principle operating here. Diffraction spoils the image, not enhances it.


Nil points. Better do some basic reading on optics again...