Can horses get glaucoma?

Yes, but it's rarely hereditary as in humans - it normally develops as a symptom of moon blindness. Laser therapy can help (although it's not always worth the expense in lower value animals).

Until fairly recently, glaucoma was not really recognized or diagnosed in horses, and its possible some older animals with mysterious blindness that developed with age could have glaucoma. Glaucoma not associated with moon blindness is most often found in Paso Fino horses.