When player has the blindness effect while swimming in lava he can see through it in the blindness range. Also when the effect ends the player can see everything around.
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Thank you for your report!
We're actually already tracking this issue in MC-120772, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
I wish this was actual feature.