Quote:
Originally Posted by Sil_liS
I'm not sure if you actually read my explanation, or you just missed the part about the eyes adjusting to the amount of light. That is done by modifying the size of your pupil.
Let's say that the amount of light coming from a light emitting screen (that you are looking at in the dark) is focused on 10% or your retina. Let's call the amount of light that falls in this case on 1% of your retina, right in the middle where the image is focused "P" for pain.
Now you turn on the light making the room as bright as the screen. That means that if the pupil would be the same size, you would have the same "P" amount of light, now for every % of your retina. However, the iris contracts, making the pupil smaller, so that the same amount falls in sum on the whole of your retina, that means that in this example your pupil will be reduced to 1/10. That means that for the 1% of the area in the center of where the image is focused you now get 10%P from the screen + 10% from the ambient light=20%P.
Obviously, you can look 5 times longer at the screen in a brightly lit room.
 |
Ok, that makes perfect sense. Thank you for detailed explanation. So the fact that screen is backlighted can interact with eye mechanics to cause those effects. I need to readjust the opinion I formed on this.
So I went back and re-read the whole thread once more - and found I missed a post:
Quote:
Originally Posted by ColdSun
Uh huh. Well thanks for that tidbit, but I think my words were pretty clear.
1. Folks who say LCD "damages" their eyes are incorrect. I do not assume that anyone here has said that but it is a popular belief these days.
2. I actually think eink technology is great. It just doesn't fit my requirement.
3. LCD causing more eye strain than another technology is purely on a person-by-person basis and more related to age and/or an issue with a user's eyes. To make you happy, I'll retract my statement about it being a myth, as eye strain exists, but LCD technology itself is not the cause. This very thread has provided responses from users that say eink causes eye strain for them, or LCD for another group of users.
4. Previous statements about eink readers and what the majority of readers desire in their device stands firm. There is no proof that even half the people that read a lot or use eink would always choose an eink device.
We can go over this again and again, and as you say this is a dead horse. The funny thing is, you don't like how I say it, but its ok for the guy above to tell everyone that LCD is bad for their eyes... Go figure. You know what though, I don't think you should be telling me how I should say anything and keep the personal opinions about me out of it.
|
So, what you're actually saying is that various people react to various screens in various ways, and you agree that some of them experience headaches reading on LCD screens, and not on e-ink screens, but what you object to is saying that the specific way the LCD technology works causes eyestrain/headaches?
I agree with that - what I was objecting to is saying that LCD screens don't cause headaches for some people, as I believe they do (as CRT screens and any other backlit screens do).
I'm sorry for not reading all the posts in the thread with enough insight to give me precise enough picture of your thoughts - and specifically for missing the importance of the one quoted above, as I think this is the only one from which it's clear to me that we're not in disagreement, just misunderstanding. I'm also sorry for some of my answers to you - having gained a thick enough skin to participate in Internet discussions, I nevertheless should have concentrated on the cause of difference of opinions more.
Though I have to say you did detract from the topic in few of your answers as well
By the way, is iPhone even LCD technology? It looks nearly the same, but I think the technology is different.