Your eye drop contains two medicines: bromonidine whose most common side effect is redness and irritation and timolol. That medicine is a beta blocker and must be watched carefully for side effects. The most common are wheezing, chronic post nasal discharge, low blood pressure, slow pulse, decreased exercise tolerance. Glaucoma affects the peripheral vision not the central vision. If you are not seeing as clear it likely is either a glasses problem, cataracts or macular degeneration. You should discuss with your ophthalmologist.