Which of the following is a common side effect of medications that might affect vision?

Medications that affect vision often have a range of side effects, and one of the most common side effects is dry eyes. This condition occurs because certain medications, particularly antihistamines, antidepressants, and some blood pressure medications, can reduce tear production or alter the tear composition, leading to discomfort and blurred vision.

Dry eyes can significantly impact a person's quality of life, causing symptoms such as irritation, redness, and a gritty sensation in the eyes. It is essential for individuals experiencing these symptoms to communicate with their healthcare provider, as there are various treatments and strategies available to manage dry eyes.

The other options are less aligned with the typical side effects linked to medications affecting vision. For example, increased peripheral vision and improved color perception would suggest a positive change, which is generally not a side effect of medications. Reduced eye pressure, on the other hand, might be beneficial in certain medical contexts (such as for glaucoma patients), but it is not a common side effect that applies across the range of medications that might affect vision. Thus, dry eyes stands out as a prevalent and recognizable side effect among the choices provided.