Eyestrain (noun)

1. Tiredness or discomfort caused by prolonged use of the eyes.
2. Tiredness or discomfort, often accompanied by headaches, caused by prolonged use of the eyes, typically when reading, working on a computer, or performing other close-up tasks.

Origin:

From the word "eye" and "strain" meaning exertion or tension.

Examples:

1. He suffered from eyestrain after working on the computer for hours.
2. The eyestrain made it difficult for her to read for long periods of time.
3. The eyestrain caused headaches and dry eyes.
4. The eyestrain was caused by staring at the screen for too long.
5. He was advised to take a break to prevent eyestrain.