Adjustable Focus 3D Printed Liquid Filled Lens
by jrombousky, published
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You can get rid of any dissolved gas by boiling the water before use. Just let it cool down and then use it as soon as possible.
Saw a pair of glasses like this in a museum, they said they were produced for poorer citizens of countries, that way everyone could have glasses, and just "inflate" them to get the correct prescription.
The bubbles can be reduced by holding the lens to that the rubber tube is upwards, then pulling the bubbles out with the syringe. I didn't spend the time in the video to do it.
The lens does keep its shape well when its held sideways. Since the plastic is stretching its always under tension and doesn't distort in any way that I could tell. If this were in a high magnification telescope it would probably be noticeable.
Haven't heard of focus-on-vision.org but I did get this idea from a TED talk where they were using liquid filled lenses for glasses in Africa, I bet its the same people.
I was looking into other fluids to put into the lens, but water was handy and readily available for a demo.
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