A liquid crystal (LC) lens with focal length variable from negative to positive is reported. There are three electrodes in the LC cell. One electrode has a circular hole in the center. The lens is driven by two voltages that produce a spatially nonuniform and symmetrical electric field in the LC layer. By adjusting the voltages, a wide range of lens power is covered. The LC lens preserves its optical quality over the entire focus range.
No takes yet. Share an insight, caveat, or question.
Wang et al. (2005) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: