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Sarmelion t1_jcs8en7 wrote

When they first went down there yes, but after we realized that we started using special cameras and lenses and such to take video in extremely low light conditions so we wouldn't disrupt the environment we were studying.

There's another really great post on this https://www.reddit.com/r/askscience/comments/2n1yd4/comment/cm9t27t/?utm_source=share&utm_medium=web2x&context=3

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ZZ9ZA t1_jd1epo3 wrote

Aren’t most deep sea creatures more or less “legally” blind anyway, as an extreme lack of light doesn’t really incentivize putting resources towards vision.

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Sarmelion t1_jd1ogzh wrote

No, they can still see usually but in narrower bands, blasting bright white light still blinds them so a lot of research folks switched to red light with special lenses, since most don't have photoreceptors for red light apparently

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