Update by [Mojang] Mega_Spud (Jay Wells):
When given the status effect of blindness, the player can see through lava.
Steps to Reproduce:
- Use the command /effect @s blindness 100 0
- Jump into a pool of lava at least 2 deep (in creative or with fire resistance)
You can see clearly through lava.
Your vision should still be obscured by the lava.
Screenshots/Videos attached: Yes
Blindness removes the fog/overlay of lava, as seen in the screenshots below.