When you are reading this post, when you are looking around, your eyes will automatically focus on the spot by reshaping our eye lens. With glass lenses as used in optics, you can achieve that only with moving a lens-system back and forward.
Optotune has introduced now a commercial tunable lens which reshapes its surface and allows continuously focusing between 20mm to 120mm by an external voltage. In the manual version you can even go from -40mm to 40mm, so from concave to convex!
This could find applications in material processing, ophthalmology or microscopy. For further applications have a look at their application homepage
Interesting is also the microscopy application:
Have fun!
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It would be interesting to know how these differ from the Varioptic liquid lenses. From the photos on their webpage, these seem larger, so perhaps they have larger diameters available.
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