Is there a specific name for total blindness?

Different kinds: Complete inability to see any light at all is usually called "no light perception" (nlp) vision. A person who can see no better than 20/200 with best glasses is considered legally blind. There are additional grades of visual loss between legal blindness and nlp including 20/400, 20/800, counting fingers at (x) feet, hand motion, and light perception with/without projection.

No Light Perception: Nlp or no light perception is the clinical term.