The nurse working in the clinic receives telephone calls from several patients who want appointments as soon as possible. Which patient should be seen first?

Rationale: A. This is most likely due to presbyopia, a common age-related change, and is not an urgent condition. B. This could be due to cataracts or age-related vision changes, but it does not indicate an immediate threat to vision. C. Loss of peripheral vision is a classic sign of glaucoma, which can lead to permanent blindness if untreated. This requires urgent evaluation. D. Dry eyes are uncomfortable but not urgent and do not pose an immediate threat to vision.