We need more info. Is he being housed indoors or out? Is he wild-caught or captive bred,if wild, do they have a permit to keep him? Desert Tortoises are protected. What are the temps of the warm side and cool side of the enclosure? How about the humidity? Can you tell us about the diet? What is offered how much and how often? Does he have access 24/7 to clean, fresh water? Eye problems usually stem from humidity or diet issues.