I had been hoping that his eye condition and sensitivity to light had been an injury and medical condition resulting from a mission aboard the Buran, possibly even the mission where the ship was lost. Little did I know they'd take an initially intriguing and "where are they taking this" plot point that held potential and turn it into arguably the dumbest and most nonsensical thing we've ever learned about the Mirror Universe...and this is a universe where officers wear gold lame sashes and even the ship's chefs probably assassinate one another.
Not sure I see the problem.