It made a lot of news stories since it was first announced but Verily aka Google has put the breaks on the glucose-sensing contact lens. You can read their statement here.
In part they say:
Meanwhile, regular old school continuous glucose monitoring has advanced in accuracy, coverage, and its place in automated insulin delivery systems.
In part they say:
Our clinical work on the glucose-sensing lens demonstrated that there was insufficient consistency in our measurements of the correlation between tear glucose and blood glucose concentrations to support the requirements of a medical device.
Meanwhile, regular old school continuous glucose monitoring has advanced in accuracy, coverage, and its place in automated insulin delivery systems.