The 'blind' status defines
A blinded creature can’t see and automatically fails any ability check that requires sight.
Many spells and effects require targets to perform a dexterity saving throw. For example, the 'Fireball' spell requires that
each creature in a 20-foot-radius sphere centered on that point must make a dexterity saving throw.
Do blind creatures automatically fail this saving throw? If not, then, which saving throws are based on sight? Do the rules specifically mention this?