Blurred Vision: Advise patients not to drive or operate machinery if vision is not clear (e.g., blurred vision). Exercise caution in night driving and other hazardous activities in poor illumination. Risk of Retinal Detachment: Rare cases of retinal tear and detachment have been reported with miotics. Individuals with preexisting retinal disease are at increased risk. Therefore, examination of the retina is advised in all patients prior to initiation of therapy. Patients should be advised to seek immediate medical care with sudden onset of flashes of lights, floaters, or vision loss. Iritis: Caution is advised in patients with iritis. Potentiation of Vascular Insufficiency: Use with caution in patients with depression, cerebral or coronary insufficiency, Raynaud's phenomenon, orthostatic hypotension, or thromboangiitis obliterans.