The Blindness Potion Effect should affect mobs.

[Delocuro]

See the Complete Features List under Vanilla Modifications > Potion Effects > Blindness. It currently has no effect on mobs, but it will need to have an effect on them for some of the more complicated tech features I have planned.

Obviously not urgent, and probably pretty complicated to add.

[Karrq]

Blindness doesn't impact the mob ai. It reduces the render distance, which is a client-only thing, otherwise you should virtually render the world for every mob, and suck up all the resources available.
Minecraft would become a black-hole...
We should talk about what it should do, actually...

[Delocuro]

Yep, I know it has no affect on mob AI currently, which is why the issue is here. What I'm saying is that we need to add some code to make it affect mobs, since ideally it would decrease their targeting range, etc. There are full details on what all it should do to mobs in the features list article mentioned above.