Have you ever felt compelled to sit in front of a projection screen for hours? Maybe you were relaxing in your home cinema in front of a Harry Potter marathon.
Or you were working on a presentation and wanted to look from the point of view of your audience.
Either way, you spent an unhealthy amount of time staring at the reflected glow of a projector, and now, you’re worried about your eyes. So, can projectors cause eye damage? Or are they a safer alternative to TVs?
That’s what I’m about to tell you, so let’s jump in!
Are Projectors Harmful to the Eyes?
No, projectors aren’t harmful to the eyes unless you stare right into the lens. Blue light is the main culprit for eye damage resulting from glowing screens.
Devices like laptops and TVs emit direct blue light into your eyes. Projectors, on the other hand, emit blue light onto a screen.
So you only indirectly stare at the light, which poses nearly no risks to your eyes.
Projector vs. TV: Which Is More Harmful?
Are you thinking about setting up a home cinema? The main appeal of such a room is the large screen in the middle.
But which is better suited for long hours of watching movies, TV shows, projectors, or TVs?
Projectors are undoubtedly better for your and your kids’ eye health. Since the blue light they produce hits a screen or a wall before it reaches your eyes, it becomes less harsh.
Also, the reflecting surface absorbs some light, bringing the amount that reaches your eyes to a minimum.
Meanwhile, staring at a TV for long hours can give you headaches, eyestrain, and mental fatigue.
That said, staring into a projector’s lens can wreak havoc on your eye health. A standard projector produces nearly 500 to 1000 nits, a unit that measures brightness.
Compared to TVs’ average 450 nits, a projector’s brightness can be dangerous.
The extra brightness and direct emission of blue light can cause eye pain or retinal detachment if you stare for a long while.
So avoid turning on a projector with the lens directed into your eyes.
Tips for Using Projectors Safely
If you want to sit in front of your projection screen for hours without worrying about your eye health, follow these tips closely.
Use Blue Light Glasses
Blue light glasses minimize the amount of blue light that reaches your eyes.
While it’s unconventional to wear them all day while watching your projection screen, you can wear them if you’re working out some issue with the projector.
This way, even if the lens unexpectedly works and emits light, the glasses will protect your eyes.
If you ditch the glasses and the lens work while directed into your eyes, you’ll feel eyestrain and lose focus for a few seconds.
Use the 20-20-20 rule.
The 20-20-20 rule states that if you’re watching a screen for a long time, you should take a break every 20 minutes and stare at an object 20 feet away from you for 20 seconds.
Doing so will give your eyes a break now and then, thus bringing eye strain to a minimum. You should also follow this rule using your laptop or smartphone.
Place the Projector Safely
Ideally, it would be best if you mount your projector to the ceiling or any place above eye level.
This way, even if you look at the projector, the lens will be above your head, not directed at your eyes.
So you won’t be able to stare at the lens by accident and expose your eyes to retinal damage.
Don’t Install the Projector Around Reflective Surfaces
Reflective surfaces like mirrors and windows should be as far away as possible from your projector.
For example, if the lens is directed toward a mirror, the mirror might reflect the light to your eyes.
Meanwhile, a screen disperses light before reflecting it, also known as diffused reflection.
This type of reflection is known as specular reflection, and it’s more concentrated than the reflection of a screen since the light goes in one direction and doesn’t get dispersed.
So, the focused light might cause you eye problems like retinal damage.
To Wrap Up
Projectors don’t cause as much eye damage as TVs, but why?
When watching a projection screen, you stare at indirect blue light that comes out of the projector lens and gets reflected by the screen.
So when it reaches you, it’s already less intense. Meanwhile, TVs emit direct blue light into your eyes, which increases the risk of multiple eye issues.