This work presents ionic liquid based variable focus lenses using electrowetting, which exhibit excellent performance over a conventional saline based lens such as good tolerance of sharp temperature variation, wide operating temperature range (which is up to 100 ℃) and in particular high stability at high temperatures.

★★★☆☆ Hu XD,Zhang SG,Qu C,et al. Ionic Liquid Based Variable Focus Lenses[J]. Soft Matter,2011,7:5941–5943.