Quote:
Originally Posted by newday07
If the front light is across the screen, why did they add the blue light filter?
This means that light comes the same in your eyes, isn't it?
And, I repeat, one thing is the ambient light, another thing is reading books with the rays pointed in the direction of the pupil...and for several hours a day  |
If you check the studies on IR and cataracts, the causative effect is the heating of the lens by the IR. If you can't feel the heat, you are very unlikely to have any issues caused by the IR exposure. Hence the studies that concentrated on workers in the steel and glass industries. If your ereader was as hot as molten steel or molten glass, you might have something to worry about.
As for the frontlight, it is distributed across the screen by light guides to give more even coverage and is intended to be reflected off the screen towards your eye. The blue light reduction is due to some studies that suggest exposure to blue light disturbs some people's ability to sleep. The IR touch screen LEDs have their emissions directed parallel to the screen and they are not intended to be reflected off the screen towards your eye. They are
NOT pointed in the direction of the pupil.
If you read with an incandescent light source or by sunlight, you are getting a lot more IR from those sources in both direct exposure and reflected from your ereader screen than from the IR touchscreen LEDs. You do notice that you and your ereader both get warm out in the sunlight? The majority of that heating is produced by IR.
The comment that comes to mind is that you are making the Andes out of a mole hill. Stop worrying and start reading!