Schematic of the varifocal meta-devices (IMAGE) City University of Hong Kong Caption Schematic of the varifocal meta-devices: doublet (left) and triplet (right) meta-devices. Credit © Zhang, J. et al. https://www.science.org/doi/10.1126/sciadv.adf8478 Usage Restrictions Image must be used with appropriate caption and credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.