This may be difficult,whats the movie?

It was late 80's early 90's.

It starts with an astronaut going into space while there he is exposed to cosmic rays (sun or Comet i can't remember) while he has his visor reflector open.

Now back on earth when in bright sunshine he has accelerated mental and physical abilities. while this is happening his eyes change colour. green, blue.......

When they reach red it means his brain is overloaded and could fail...

any help would be great thanks.