Alt link for the study information: https://www.sciencealert.com/scientists-used-stem-cells-to-make-mini-brains-they-grew-rudimentary-eyes

OP link asked me to sub to continue reading, so I found this other link which mentions the same study and its potential.
A very generalized TLDR is: Scientists grew a type of mini-brain that grew rudimentary eyes that would form naturally in embryos. Usually eyes are grown separately for study. Eyes were not grown to completion yet, this is the next step.

Many thanks to OP for finidng this study! One step closer to eye transplantation or cybernetic eyes...with lasers (for self-defense, obviously).