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?

Choice A rationale This instruction is incorrect because chronic open angle glaucoma is typically asymptomatic and painless until significant optic nerve damage has occurred. Timolol is a nonselective beta-adrenergic blocker used to reduce intraocular pressure, not an analgesic for acute pain. Relying on pain as a trigger for administration would lead to inconsistent dosing, allowing intraocular pressure to rise and causing irreversible vision loss from progressive nerve fiber layer destruction. Choice B rationale This is the correct instruction because open angle glaucoma is a chronic, progressive condition that currently has no cure. Timolol works by decreasing the production of aqueous humor in the ciliary body. To maintain intraocular pressure within the normal range of 10 to 21 mmHg and prevent further damage to the optic nerve, the medication must be used consistently every day for the remainder of the client's life. Choice C rationale This instruction is medically inaccurate for the management of glaucoma. Tapering medications after 10 days is a common protocol for acute inflammatory conditions treated with steroids, but it is inappropriate for glaucoma therapy. Discontinuing or tapering timolol would result in a rebound increase in intraocular pressure, which poses a severe risk for accelerated blindness. This condition requires permanent, life-long daily maintenance rather than a short-term therapeutic course. Choice D rationale This statement is misleading because it implies that the medication can be stopped once a normal intraocular pressure of 10 to 21 mmHg is achieved. In glaucoma management, reaching a target pressure does not mean the underlying pathology is resolved. The pressure is only maintained at normal levels because of the pharmacological action of the eye drops. If the client stops using the medication, the intraocular pressure will inevitably rise again.