i've recently learned a lot about optics and the working of the eye in my physics class and from this course i have realised the harm in watching tv in a dark surrounding.
The focal lenght of the eye has to adjust each time a scene on tv is changed [which lasts for about 9 seconds] so this causes strain on the eye and due to this, the eye defects worsen. i tried explaining this fact to my friends but they think its not true. i care about their eyes but they don't seem to care.
am i wrong in this?? ps all this was xcplained by my phy teacher!
2007-07-29 08:45:06 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Yes, you are right. Have you ever sat at the computer in darkness and changed from a red screen to a blue one? Trust me, it's not a pretty sight!
2007-07-29 09:00:41 · answer #1 · answered by Anonymous · 0⤊ 2⤋
You are incorrect. The eye does *not* have to refocus on the tv screen every time the scene changes. Regardless of whether the scene is of a close-up or a panoramic view, the eye is focused at the distance of the tv screen. Watching tv in the dark, however, may cause eye strain by having the pupil frequently dilating when you look away from the tv and contracting when you look towards it. That's done by muscles in the eye. Also, your depth of focus is less when the eyes are dilated, making it more of a struggle to keep in focus on the tv screen.
2007-07-29 16:45:39 · answer #2 · answered by Dr. R 7 · 3⤊ 0⤋
I disagree.
Your eyes focus on the screen and do not change their focus when a scene changes.
You are watching a two-dimensional image at a fixed distance from your eyes.
2007-07-29 16:45:55 · answer #3 · answered by J C 5 · 0⤊ 0⤋
yea..its true..but if your friends dont want to believe you thats gonna be their problem..but whether they believe you or not..they probably wont stop watching tv or anything like that..so try 2 just let it go and not get into an argument with your friends
2007-07-29 16:03:38 · answer #4 · answered by Anonymous · 0⤊ 2⤋