A nurse is caring for a client who reports a decrease in central vision. The nurse should identify that this is a manifestation of which of the following visual impairments?

Choice A reason: This is incorrect because it is necessary to remove contact lenses before administering medications. Contact lenses can absorb or interfere with the absorption of eye drops and cause irritation or infection. The nurse should instruct the client to remove contact lenses before applying eye drops and wait at least 15 minutes before reinserting them.
Choice B reason: This is incorrect because administering the medications by touching the tip of the dropper to the sclera of the eye can cause contamination or injury. The sclera is the white part of the eye that covers most of the eyeball. The nurse should instruct the client to avoid touching the tip of the dropper to any part of the eye or eyelid and hold it about 1 cm above the lower eyelid.
Choice C reason: This is correct because administering the medications 5 min apart can prevent dilution or washout of one medication by another. Timolol and pilocarpine are two different types of eye drops that are used to treat open-angle glaucoma, which is a condition that causes increased pressure inside the eye and damage to the optic nerve. Timolol is a beta-blocker that reduces the production of fluid in the eye, and pilocarpine is a cholinergic agent that increases the drainage of fluid from the eye. The nurse should instruct the client to apply one drop of each medication in the affected eye(s) and wait at least 5 minutes between each medication.
Choice D reason: This is incorrect because holding pressure on the conjunctival sac for 2 min following the application of eye drops can reduce systemic absorption and side effects of eye drops. The conjunctival sac is the space between the lower eyelid and the eyeball. The nurse should instruct the client to gently close their eyes after applying eye drops and press their index finger against the inner corner of their eye for 2 minutes. This can block the tear duct that drains fluid from the eye to the nose and prevent it from entering the bloodstream.

Choice A Reason: Head trauma is not one of the top causes of blindness in the United States, but rather a possible cause of it. Head trauma can damage the optic nerve, retina, or brain, leading to vision loss or impairment.

Choice B Reason: Cardiovascular disease is not one of the top causes of blindness in the United States, but rather a risk factor for it. Cardiovascular disease can affect the blood supply and oxygen delivery to the eyes, leading to conditions such as glaucoma, macular degeneration, or retinal vein occlusion.

Choice C Reason: Syphilis is not one of the top causes of blindness in the United States, but rather a rare cause of it. Syphilis is a sexually transmitted infection that can affect the eyes, leading to inflammation, scarring, or detachment of the retina.

Choice D Reason: This is the correct choice. Diabetic retinopathy is one of the top causes of blindness in the United States, affecting about 4.1 million adults. Diabetic retinopathy is a complication of diabetes that damages the blood vessels in the retina, leading to bleeding, swelling, or leakage of fluid. It can cause blurred vision, floaters, or blindness if left untreated.