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Adjustable Focus 3D Printed Liquid Filled Lens

by jrombousky, published

Adjustable Focus 3D Printed Liquid Filled Lens by jrombousky Mar 4, 2013

Description

This is an Adjustable Focus Liquid Filled Lens. You use thin plastic film and then inflate it with water. The water then under pressure, stretches out the plastic and forms a lens shape.

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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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Instructions

Print out both the Top and Bottom Hex rings and 8 clips. The instructions for assembly are on my blog: trenchphysics.com

Here is the video of how to assemble it:
youtube.com/watch?v=bb3APIht_PM

Comments

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ComradeQuiche on Mar 26, 2013 said:

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.

Schorhr on Mar 4, 2013 said:

That's really nice.
I've seen some under-water magnifying tubes using clear plastic, but this would be great for building something like a simple children's microscope.

jrombousky on Mar 4, 2013 said:

The way I've designed the plates you can stack as many lenses as you like and make as many chambers of air or water as you like. You should even be able to make a concave lens for the eye piece with this. I just haven't experimented with it yet. I love the idea of a microscope or a telescope

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