Asthenopia commonly includes headaches and eye strain during visual tasks.

• A. It occurs during or after visual tasks
• B. It occurs only at night
• C. It is unrelated to vision tasks
• D. It is primarily a color vision issue

Answer: (A)

Asthenopia is eye strain and discomfort that shows up with sustained visual work, especially tasks at near like reading or computer use. The key point is the timing: symptoms such as headaches, eye fatigue, or blurry vision tend to appear during the visual task or shortly after you stop, because the visual system is working hard to maintain clear focus and proper eye alignment. This makes the statement that it occurs during or after visual tasks the best description, since it directly ties the symptoms to the activity that taxes accommodation and binocular coordination.

It wouldn’t be limited to night-time experiences, which would suggest a different set of factors like lighting or circadian influences rather than the strain from near work. It isn’t unrelated to vision tasks, because the whole concept of asthenopia is built around strain from visual activity. It isn’t primarily a color vision issue, which would involve difficulties with seeing colors rather than general eye fatigue and headaches caused by focused visual effort.