LiveFromKyoto said:
Poor choice of wording on my part.
They directly quote Dr. Travis Meredith, chair of the ophthalmology department at the University of North Carolina, Michael Bove, director of the Consumer Electronics Laboratory at the M.I.T. Media Lab, Alan Hedge, director of the Human Factors and Ergonomics Laboratory at Cornell University, and Carl Taussig, director of Hewlett-Packards Information Surfaces Lab.
Those guys' credentials >>>>>>>>> knee jerk insta-skepticism. And I'm sure their opinions rest on more than a single study.
Appeal to Authority fallacy aside, did you take a critical look at what these experts actually said?
Most of what our mothers told us about our eyes was wrong, said Dr. Travis Meredith, chair of the ophthalmology department at the University of North Carolina, Chapel Hill. Sitting close to a television, or computer screen, isnt bad for our eyes. Its a variety of other factors that can cause physical fatigue.
For example, the ergonomics of reading screens and the lack of blinking when we stare at them play a big role in eye fatigue. The current problem with reading on screens is that we need to adjust our bodies to our computer screens, rather than the screens adjusting to us, Dr. Meredith said.
He is saying that there is nothing inherently wrong with electronics screens, but the problem comes in the way the human body interacts with them. If you are able to change your body's reactions, then you will not have a problem.
How useful is this observation? Are you willing to consciously control the rate at which you blink when reading from those screens? I don't see any feasible techniques listed to adjust one's body.
It depends on the viewing circumstances, including the software and typography on the screen, said Mr. Bove. Right now E Ink is great in sunlight, but in certain situations, a piece of paper can be a better display than E Ink, and in dim light, an LCD display can be better than all of these technologies.
All he says about LCDs is that they are easy to read in a dark room. I don't think this is news to anyone.
When we read, Dr. Hedge explained, a series of ocular muscles jump around and can cause strain, regardless of whether we are looking at pixels or paper. While youre reading, your eyes make about 10,000 movements an hour. Its important to take a step back every 20 minutes and let your eyes rest, he said.
He says that one source of strain is caused by eye movement, and that it can be relieved with frequent breaks.
He doesn't say that this is the only factor in eye strain, nor does he say whether the rate at which this type of strain accumulates varies depending on what we are looking it.
Todays screens are definitely less tiring to look at than older displays, which refreshed the image much less frequently, causing a flicker. Carl Taussig, director of Hewlett-Packards Information Surfaces Lab, said the 120 Hz refresh rate typical of modern screens is much quicker than our eyes can even see.
The new LCDs dont affect your eyes, Mr. Taussig said. Todays screens update every eight milliseconds, whereas the human eye is moving at a speed between 10 and 30 milliseconds.
Mr. Taussig said consumers will pick the type of screen that makes sense on an individual basis. I dont think there is a single technology that will be optimum for all the things we want to do with our devices. For example, H.P. sells 65 million displays a year, and they are all used in a different way.
He says that if you have a 120 Hz LCD, your eye will not be able to detect the refresh rate, since it is faster than the speed of the human eye.
It is implied that a 60 Hz screen would affect some people's eyes, since it would update every 17 ms. His quote also sounds a bit like a sales pitch.
In summary:
-If you are trying to read in a dark room with no other light sources, an LCD is better than paper or e-ink.
-If you are reading in a well-lit room, an LCD can be comparable to paper/e-ink if you are able to adjust physiological processes such as the rate at which you blink to adapt.
-If you are able to take a break every 20 minutes, you will have less eyestrain regardless of what you are looking at.
-If your screen's refresh rate is above 120 Hz, the refresh process won't contribute to eye strain.