| Avoid stripes, checkered or other patterns, which can be visually confusing and cause eyestrain and optical illusions. |
| After viewing stereo games for a while I get some headache, eyestrain or the image seems out of focus. |
| They also help to improve durability, ease of maintenance and eye protection, while reducing eyestrain. |
| The astigmatic person does not know which focal line to look at, and hunting between the two may cause eyestrain. |
| In people with perfectly normal eyes, eyestrain may indicate abnormalities of muscle balance or refractive errors. |
| Good excuse if you get caught looking at somebody, just tell him or her you're preventing eyestrain. |
