Patent ID: 7352514

Claim:
A variable focus lens comprising a fluid chamber ( 10 ) containing a first fluid (A) and a second fluid (B), the fluids being non-miscible and in contact over a meniscus ( 12 ), means ( 14 , 16 ) for applying an electric field over the fluid chamber such that the shape of the meniscus varies in dependence on the electric field, the first fluid having an index of refraction n 1 and an Abbe number V 1 , and the second fluid having an index of refraction n 2 and an Abbe number V 2 , n 1 being different from n 2 , wherein the parameters n 1 , n 2 , V 1 and V 2 comply with the following relation: 0.75 < V 1 ⁡ ( n 2 - 1 ) V 2 ⁡ ( n 1 - 1 ) < 1.25 . ( I )