Which condition is characterized by eye strain and discomfort?

Asthenopia is the condition characterized specifically by eye strain and discomfort, often experienced after prolonged visual tasks such as reading, using a computer, or engaging in other activities that require intense focus. This condition can present symptoms such as fatigue, headaches, blurred vision, and difficulty concentrating, all related to the overuse of the eye muscles.

In contrast, ametropia refers to a general term for refractive errors where the eye does not focus light properly, leading to blurred vision without the specific strain characteristics of asthenopia. Diplopia denotes double vision, which arises from a misalignment of the eyes or neurological disorders, and does not directly relate to eye strain or discomfort. Anisocoria involves unequal pupil sizes, which may indicate underlying health issues, but does not inherently result in eye strain or discomfort.

Thus, asthenopia is the most directly aligned with the symptoms of eye strain and discomfort.