Hyoma may be blind, but that is hardly a weakness. His lack of sight has heightened his hearing, and he can detect the exact number of enemies approaching from miles away. Wise and honorable, he also hides a terrifying power. He is Gennosuke's master as well as his uncle, and has trained him since he was a small child. Hyoma believes in Gennosuke's leadership, and is willing to defend Gennosuke with his own life.
(Source: FUNimation's Official Basilisk Website)