I have been trying to create an Eldritch Invocation that grants the blind vision of the Sorcerer, but I am not sure to what extent this blind vision should be extended. Initially I thought about comparing it with the pre-existing Devil's Sight invocation, which gives 120 feet of dark vision through magical and non-magical darkness, but blind vision is (obviously) far superior to dark vision, so I abandoned that comparison.
Here is the current form of this Eldritch Invocation:
There are no prerequisites
You get a blind vision that reaches up to 15 feet.
Is this invocation of Eldritch balanced?