 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  Remember to use it at the same time each day. Keep using latanoprost even if you feel well. Most people with glaucoma or high pressure in the eye do not feel sick. If you are using another kind of eye medication (such as drops or ointments), wait at least 5 minutes before applying other products. Use eye drops before eye ointments to allow the eye drops to enter the eye.The side effects of Xalatan Ophthalmic (Eye): Blurred vision, burning/stinging/itching/redness of the eye, feeling as if something is in the eye, changes in eyelash number/color/length/thickness, eyelid changes/skin darkening, dry eye, lid crusting/discomfort, or increased sensitivity to light may occur. If any of these effects last or get worse, notify your doctor or pharmacist promptly. This medication may slowly (over months to years) cause brown discoloration of the colored portion of the eye (iris). If you are using latanoprost in only one eye, only that iris may change color. This color change may be permanent but the long-term effects are uncertain. Notify your doctor if this occurs and schedule regular </s>