| But the price paid is a slightly jerkier image and a flickering that can cause headaches and eyestrain. |
| They also help to improve durability, ease of maintenance and eye protection, while reducing eyestrain. |
| Benefits: improved durability, easy maintenance, visual comfort, eye protection, reduced eyestrain. |
| The latter factor is often ignored, but insufficient illumination can cause eyestrain and physical discomfort. |
| Little wonder, then, that 3D films have earned a reputation for dimness and causing eyestrain. |
| In people with perfectly normal eyes, eyestrain may indicate abnormalities of muscle balance or refractive errors. |
