To concur, there was a fascinating TED talk[0] from Chris Hadfield about having to complete an extra-vehicular operation having gone blind in both eyes, as an u

To concur, there was a fascinating TED talk[0] from Chris Hadfield about having to complete an extra-vehicular operation having gone blind in both eyes, as an unexpected consequence of the anti-fog mixture that was in use. [0]: https://www.youtube.com/watch?v=Zo62S0ulqhA https://www.youtube.com/watch?v=Zo62S0ulqhA