how do fluid filled lenses work? what is the physics behind them and why is silicon oil in...

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how do fluid filled lenses work? what is the physics behind them and why is silicon oil in particular used?

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Q: How do fluid filled lenses work? What is the physics behind them and why is silicon oil in particular 
used? 
The fluid filled lenses called Adspecs were developed by Josh Silver to correct vision of people in 
developing countries who could not afford a visit to the ophthalmologist. The refractive power of each 
lens can be adjusted independently for best possible viewing. The fluid-filled lenses are “variable power 
spherical lenses”. [1] Two thin membranes of 23 micrometer thickness are sealed at the circular 
boundary of the lens. The space enclosed by the membranes is filled with a liquid of refractive index 
1.579. The optical power of the lens depends on the curvature of the lens and hence on the amount of 
fluid dilled inside it.  
Physics behind the fluid filled lenses [2] 
Figure on the left shows a convex lens at work. 
When light from the left falls incident at all 
points on the lens, it bends it inward and all rays 
meet at a focal point at distance f. This happens 
because of a phenomenon called refraction of 
light.
Similarly, this figure shows a concave lens. The shape of 
this lens makes it bend the incoming light rays outward 
and hence they focus at a focal point on the incoming 
side of light.  
Both of these types of lenses are used for correcting eye 
power in myopia and hypermetropia affected people.

how do fluid filled lenses work? what is the physics behind them and why is silicon oil in particular used?

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