Blindness/Deafness
One creature that you can see within range must succeed on a Constitution saving throw, or it has the Blinded or Deafened condition (your choice) for the duration. At the end of each of its turns, the target repeats the save, ending the spell on itself on a success.
Using a Higher-Level Spell Slot. You can target one additional creature for each spell slot level above 2.
Blindness/Deafness 5e 2024 vs. 2014 edition differences
The 2024 version increases range from 30 to 120 feet, removes class restrictions, and states the target "must succeed" on the save, implying the save is mandatory rather than optional. It also clarifies the target "has the Blinded or Deafened condition" instead of being blinded or deafened. The saving throw is repeated each turn, with the spell ending on a success.