Are Snakes Blind Or Deaf?

Neither its ears are on the inside and the snake can see perfectly

Snakes are deaf to airborne sound waves, since they have no external ear openings, no ear canals and no ear drums.  A snake could not hear people talking, for instance.  Snakes DO have well-developed inner ears, which pick up vibrations through solid material and transmit these as nerve impulses to the snake's brain, and the inner ear also helps the snake maintain balance and equilibrium, especially while climbing.  Many snake species are near-sighted, which means they do not see well if things are far away, and there are a few tiny burrowing species that have such tiny, vestigial eyes that they probably cannot see other than to distinguish between light and dark, but most snakes do see quite well close-up.  Some. Like the Coachwhips and Racers and tropical Vine Snakes, probably see very well at the same distances we can see.

They are neither.
Many snakes can see excellently, and in many more wavelengths than humans.
The Diamondback rattlesnake can 'see' the heat coming from it's surroundings even in total darkness.

They can also hear, but not like humans. They put their head on the ground and feel the vibrations in it. Like if you put your ear on the desk then very softly tapped the other side of the desk.