An optical lens comprising: a front curve lens (201, 301, 404, 501) comprising a front curve lens exterior surface and a front curve lens interior surface, wherein both said front curve lens exterior surface and said front curve lens interior surface comprise an arcuate shape; a back curve lens (202, 302, 502) comprising a back curve lens interior surface and a back curve lens exterior surface, wherein both said back curve lens interior surface and the back curve lens exterior surface comprise an arcuate shape, said back curve lens positioned proximate to said front curve lens such that said front curve lens interior surface and said back curve lens interior surface form a cavity (210, 311, 409) therebetween and an optical axis through said front curve lens and said back curve lens and an optical quality through the optical axis; a volume of saline solution (207, 306, 406, 503, 603) and oil (208, 307, 407, 504, 602) contained within the cavity formed between said front curve lens interior surface and said back curve lens interior surface, said volume of saline solution and oil comprising a meniscus (211, 314, 401, 505) therebetween; characterised in that the optical lens comprises a meniscus wall (405, 506, 601) wherein discontinuities at both ends of the meniscus wall act as boundaries for movement of the meniscus, wherein the meniscus wall comprises a general shape of a conical frustum formed in one or both of the front curve lens and back curve lens and bordering the meniscus (211, 314, 401, 505) formed between the saline solution and oil and at least a portion of the conical frustum being concave in relation to the optical axis; a conductive coating (209, 303) on at least a portion of said meniscus wall wherein application of an electrical current across the conductive coating (209, 303) causes movement of the meniscus (211, 314, 401, 505) resulting in a negative add power in the optical quality through the optical axis. a front curve lens (201, 301, 404, 501) comprising a front curve lens exterior surface and a front curve lens interior surface, wherein both said front curve lens exterior surface and said front curve lens interior surface comprise an arcuate shape; a back curve lens (202, 302, 502) comprising a back curve lens interior surface and a back curve lens exterior surface, wherein both said back curve lens interior surface and the back curve lens exterior surface comprise an arcuate shape, said back curve lens positioned proximate to said front curve lens such that said front curve lens interior surface and said back curve lens interior surface form a cavity (210, 311, 409) therebetween and an optical axis through said front curve lens and said back curve lens and an optical quality through the optical axis; a volume of saline solution (207, 306, 406, 503, 603) and oil (208, 307, 407, 504, 602) contained within the cavity formed between said front curve lens interior surface and said back curve lens interior surface, said volume of saline solution and oil comprising a meniscus (211, 314, 401, 505) therebetween; characterised in that the optical lens comprises a meniscus wall (405, 506, 601) wherein discontinuities at both ends of the meniscus wall act as boundaries for movement of the meniscus, wherein the meniscus wall comprises a general shape of a conical frustum formed in one or both of the front curve lens and back curve lens and bordering the meniscus (211, 314, 401, 505) formed between the saline solution and oil and at least a portion of the conical frustum being concave in relation to the optical axis; a conductive coating (209, 303) on at least a portion of said meniscus wall wherein application of an electrical current across the conductive coating (209, 303) causes movement of the meniscus (211, 314, 401, 505) resulting in a negative add power in the optical quality through the optical axis.