There are usually no early warning signs of glaucoma, although glaucoma causes vision loss in about half of the 2.5 million Americans who have this disease. Glaucoma is the second leading cause of blindness in the U.S. today. Your vision care plan will allow for a regular eye exam that allows the eye doctor to help determine if you have glaucoma. The treatment for this condition is typically covered under your medical care plan. Please review the benefits covered under your vision and medical care plans to confirm the level of coverage for diagnosis and treatment.