A nurse at an ophthalmology clinic is providing teaching to a client who has open-angle glaucoma and a new prescription for timolol eye drops. Which of the following instructions should the nurse provide?

The correct answer is D: The medication should be applied on a regular schedule for the rest of the client's life. Timolol eye drops are used to lower intraocular pressure in open-angle glaucoma. Consistent use is crucial to maintain the desired effect of lowering the pressure within the eye. Open-angle glaucoma is a chronic condition that requires ongoing management to prevent vision loss. Instructions A, B, and C are incorrect because timolol eye drops should not be used based on eye pain, a specific time frame, or until intraocular pressure returns to normal, as the goal is to prevent further damage.