What is a common side effect of medications affecting vision?

B is the correct choice because certain medications can indeed lead to altered color perception as a side effect. For example, some medications that affect the central nervous system or those used in managing conditions such as hypertension or diabetes can interfere with how the brain interprets color signals. This alteration in color perception might manifest as the inability to distinguish between certain colors or perceiving colors differently from what they are in reality.

The other options do not accurately reflect common side effects associated with medications that affect vision. Increased visual acuity, enhanced peripheral vision, and reduced need for glasses are not typical outcomes of medication. In fact, many medications might result in decreased visual acuity or other visual disturbances, rather than improvements in vision or the reduction of vision correction needs.