Tinted lenses improve contrast in some conditions: a dark lens helps in bright light, a clear or yellow lens reads better under overcast skies. On a poorly lit indoor range, a lens that is too dark degrades your view of the target and tires the eye.
Watch for a common confusion: tint is not an indicator of protection. A very dark lens can be a plain fashion accessory with no mechanical strength. The level of protection is read in the marking, never in the colour.
Muffs sit over the arms of your glasses: thick arms stop the cushion sealing and the hearing protection loses effectiveness. Try both together before you commit.
Behind a scope, your eye has to sit at the right distance. A frame that is too high or thick lenses can disturb the position and open a gap between cheek and stock. Again, test the complete combination, not each item on its own.