Doctor Who Series 10: 11 Easter Eggs & References In 'Oxygen'
5. Playing A Blinder
The outcome of the Doctor's unprotected jaunt into space is that he goes temporarily (or so he claims) blind.
This is the first time this has happened to the Doctor, but several companions have lost the use of their peepers in the past. First, Sarah Jane lost her sight after staring at a flash of light in 1976's The Brain of Morbius. A similar thing then happened to her successor in the TARDIS, Leela, when she gazed at the explosion of the Rutan ship. In that case, the incident also changed her eye colour (in real life, actress Louise Jameson could no longer wear the brown contact lenses).
Finally, Grace briefly lost her sight after the Master used her human retinal structure to open the TARDIS' Eye of Harmony in the aforementioned Doctor Who: The Movie.