3D, A 3-dimensional view of anything we see that is taking a view of length width and height of an object. We are moving towards 3d for a better experience of things. But we are not using this technique often. Is it bad for our eyes or our health?
What is 3D?
It is a stereoscopic film that is a process in which two photographs of the same object taken from the different angle making an illusion. This will look blurry when you are not wearing a 3D eyeglass.
Why it looks blurry
- The first reason is due to the polarised lenses that are used for 3D movies. These lenses reduce the light intensity up to 80 percent. We use polarisation lense because light reflects in every direction and when a ray hits a flat surface, the reflected light shines back at your eye which causes glare. Polarized glass absorbs horizontal light waves only vertical waves are allowed to pass which eliminates glare.
- When we are watching a 3D movie, the 3D effect is focused on what the director or cinematographer is focusing on. But your eyes trying to bring the distant object into focus. But the moviemaker does not print it in focus. So we feel blurry.
How our eyes can see in 3D?
Our eyes also see from different angles. You can try it, Look an object in front of you. Now close your one eye and see, then do the same with other. Now as you observe your left eye sees a bit more of the left side of the object, and your right eye sees a bit more of its right side. Your brain fuses the two images together allowing you to see in three dimensions.
How 3D goggles filter this effect?
3D glasses use the same polarising filters to separate the two images. They allow our eye to see the picture from a certain angle and thus create an illusion for our eyes. It has a coating one with red and other with blue to eliminate certain lights. One lens is line linear polarised and the other is circular polarised
How 3D Films work?
When we wanna make a 3D movie, we must record the film using two camera lenses that capture the movie in two different angles. When playing in cinemas these two reels are projected through a different polarized filter to create an illusion. That is if seen by the polarized lens, left eyes polarised on a horizontal plane, whereas images destined for their right eyes are polarised on a vertical plane.
This is same having a reel on a reel with different focusing effects. The cinematographer focus on what he wants to show rather on focusing here and there.
Is it bad for our eyes?
You heard about not to watch 3D movies as it effects on your eyes badly. They complain about nausea and headache issues. Actually, no. The headaches and nausea are basically the results of stress from your eyes and brain having to work differently to process images. As far as your eyesight goes, there is no evidence suggesting that 3D movies cause long-term vision problems.