Bionic optical imaging system with aspheric solid–liquid mixed variable-focus lens

Through-focus or volumetric type of optical imaging methods: a review

“…3(a) is that the fluid pressure inside two flexible membranes is varied to make the membranes inflate or deflate. This process alters the radius of curvature of the membranes and thus changes the effective focal length of the lens, allowing TF image collection (54–62). The membrane curvature can alternatively be varied by different mechanisms such as changing the aperture diameter thus squeezing the membranes (63).…”

Gabor superlens with variable focus

“…This process has several similitudes with the accommodation of the human eye [8] due to the fact that the human crystalline lens adjusts its shape to correctly focus the eye in response to visual demand [8][9][10] rather than shifting its position as other mechanical systems. For this reason, the tunable liquid lens has been considered as an option for developing bionic eyes to mimic the function of the human crystalline lens [11] .…”