An electrically controlled focus-tunable lens (FTL) allows for precise, continuous, and dynamic power adjustment over a range of diopters. While the FTLs are often positioned horizontally with a vertically aligned optical axis, certain applications require alternative orientations, which can introduce coma aberration due to gravitational effects on the optical fluid and elastic membrane of the device. This study examines the optical performance of a newly designed gravity-compensated FTL (Optotune EL-16-40-GTC-VIS-5D) by evaluating its addressed optical power and measured wavefront error, in both horizontal and vertical lens orientation. The results were compared to two standard, non-compensated models from the same manufacturer. All tested FTLs exhibited excellent optical power performance regardless of orientation, while the gravity-compensated model effectively corrected vertical coma when positioned upright.

This work has been sponsored by the Agencia Estatal de Investigación (PID2020-114582RB-I00/AEI/10.13039/501100011033)

Peer Reviewed