<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing dryness in my eyes for a while now, and its becoming quite uncomfortable. What could be causing this?  <response>: It sounds like you may have dry eye of unknown cause. To treat this condition, I recommend a combination of medications, including Cyclosporine Ophthalmic, Latanoprost, Tropicamide Ophthalmic, Loteprednol Ophthalmic, Phenylephrine Duramax, Travoprost Travatan, Ocular Lubricant, Prednisolone Ophthalmic, Timolol, Fluorometholone Ophthalmic, Brimonidine-Timolol Ophthalmic, Brimonidine Ophthalmic. 