Experimental setup (IMAGE) Optica Caption Researchers developed a very thin lens with a continuously tunable focal length and showed that it can help overcome vergence-accommodation conflict in an AR system. Credit Yan Li, Shanghai Jiao Tong University Usage Restrictions None License Original 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.