When I take viagra, all the light looks a bit fluorescent and blue. Should I switch to Cialis or levitra (vardenafil) or will they have the same effect?

No need to switch. Viagra inhibits an enzyme in the eye which affects perception of blue. This is a temporary side effect with no permanent damage. Cialis and Levitra (vardenafil) don't tend to cause this.
Maybe same effect. "seeing blue" is a common side effect of this entire class of drugs, however, one might have less of the effect than another so it might be worthwhile to try a different one.