CurtPalme.com Home Theater Forum

[David_Web]

Today when I finally got the projector into a working order I could not help hut spend some time to watch it.

An unknown time later my eyes where getting pretty tired.
It could just be that I spend some time concentrating on too small text that was somewhat blurry to boot (quick setup).
But that won't explain why it got worse while watching clips from movies later.
And it's not like I haven't stared at screens for a long time before.

I did notice that I got a bit tired while watching the projector last time but I shrugged it off then.

So has any one else experienced something similar or have a solution?
Maybe it has to be set up better.

[HaydnG90]

Only if I'm watching a DLP pj.

[Phoenixed]

[fuchs]

you have that in similar situations like cinema, too?
You might find the answer in making just a tiny little amount of "side" light so the room isn't 100% dark. Maybe it helps a bit.

Unless there's some technical issue ofcourse.

I get tired of the flicker if the refresh rate is <72Hz.
The obvious solution to that is to use >72Hz.

And yes , DO align/converge the projector properly, dammit

[CIR Engineering]

You may be sitting too close to the screen. Ideally for most people you should sit 1.3x the width of the screen back from the screen. So if your screen is 3 meters wide, you should sit 3.9 meters away from the screen (or more) to minimize eye strain.

The idea is that you should not have to move your eyes at all while watching. You should be far enough back so that you don't need to move your eyes.

craigr

[AnalogRocks]

[AnalogRocks]

[tanwn]

if your crt is not properly calbrated or color temperature is grossly wrong or wrong color space may cause it.

[kal]

[kal]

[ecrabb]

[digitalayon]

I thought it was called two shots and a cheap date.

[draganm]

I sit 1.2X from screen and have never gotten eye strain, even after a 4 or 5 hour double feature. My ass hurts from sitting, even on a couch, but never my eye-balls
Crappy screens, low powered projectors, blurry images, or digital artifacts, those can cause eye strain

[David_Web]

PJ is a Marquee 7500 + 1000
Screen is tupplur from IKEA. Not exactly flat so I got some bad focus but it is adequate for testing. I didn't want to waste too much setup time on it so geometry and the like was just eyeballed to "ok" levels.

Tennis-match is not it I think as I can read for hours on a computer screen.

Brightness might be some of the issue, I corrected some of the black level by increasing gamma. At least until I can calibrate it color wise.

The sensation was a little like a burning at the back of my eyes. Is it possible the PJ emits UV radiation?

A black room with a bright screen is nothing new to me so that is not usually a problem.

I ran it at 1920x1200@60Hz this time.
Last time I used 1080i at 96Hz.

I can understand text being very bad if unsharp, but movie content should not be as picky.

Kind of scratching my head here.
Maybe a combination of the image being a little bit unsharp and dark causes my eyelids to open more than usual and that causes some strain that shows up as a burning/sand sensation at the back of the eye.

[ecrabb]

Burning at the back of the eyes... That sounds like light/dark fatigue to me. What's your screen size and viewing distance, David?

I'm just guessing, but I'd imagine the IKEA blind material is probably <1.0 gain. Smaller screen size could compensate, though.

SC

[nettwerkjohn]

viewing fatigue corresponds with: number of beers in me, time of the day, and is perversely related to the number and size of explosions on screen. say, the climactic battle in private ryan - i'll be asleep in, oh, about 15 seconds. something like, say, rev/s/olution road (that truly god-awful thing with winslet and decaprio) will keep me glued. aaaaaggggghhhh! man, i want those 2 hours back...

[wallace123456]

I get fatiuge on almost everything except for CRT. If I get tired or fall asleep watching the projector, I am usually wiped out all togetehr anyway.

wallace

[Jesse S]

Light colored walls/ceiling/floor can cause eye fatigue. My room is entirely black and even a scene change between black as night and bright as day causes virtually no eye strain. Before when my room had a white ceiling and light colors here and there, the changes in light would "spill" into the room and I think the extra light in the peripheral vision caused fatigue. This is one reason why good movie theaters are mostly black, especially right around the screen.

[km987654]

[draganm]