Visual Fatigue comprises all those symptoms that arise after excessive stress on any of the functions of the eye. Among the most important of these are straining the clarity muscle of accommodation by looking too closely at very small objects and the effects of strong local contrasts on the retina.

Symptoms:

1. Painful irritation.
2. Double vision.
3. Headache.
4. Reduction of the power of accommodation and hence reduction of visual acuity.
   

Risk factors:

1. Aging
2. Inadequate food nutrition
3. General fatigue.
4. Smoking
5. Pollution.