And again, sight (or any sense) is merely the input, but without the input we have and are nothing.
It is also reasonably certain to say that there exist no living beings who would be bereft of any and all sensory input. We have no actual living beings whom we could study or communicate with to find out what it is like to be bereft of sensory input.
We don't know what it is like to be bereft of sensory input, so we can't say we would indeed be nothing without sensory input.
Your above premise cannot be tested.