As humans, our stereoscopic vision has given us an evolutionary advantage since primeval times. Finally, thanks to sophisticated 3D glasses, we can now watch TV or wide-screen movies in 3D. This modern technology attempts to trick the mind by imitating our stereoscopic vision.
A great white shark in your face, or a Formula 1 race happening all around you. When you wear 3D glasses to watch 3D movies on TV or a big movie screen, it's as if the action on the screen is going on right there in the room with you. It's an amazing visual experience, but just how does it work?
The human eye is perfectly designed for 3D vision. The distance between our eyes, about two and a half inches, plays a crucial role here. 3D movies work based on the biological fact that our two eyes see different images. We cannot see three-dimensionally with just one eye. Our brain has to put the two images together before we can see one three-dimensional image. This is how we are able to perceive depth and distances from different perspectives.
3D films on television or the big movie screen attempt to trick our mind by imitating the sophisticated technology of a pair of eyes. This only works if the cameras record two parallel images at a distance of exactly 2.5 inches apart. This might sound complicated, but it's actually technology that's been around for 150 years. Such images are also called stereoscopic photos. 3D movies are the next logical advancement in this technology. To get the most enjoyment out of 3D movies, you need 3D viewing media such as glasses with red/green lenses, 3D televisions with 3D glasses or video glasses. A few companies have already introduced 3D televisions that don't require glasses, but according to experts, this technology is not yet fully developed. Current models only work for one person sitting at a very specific angle to the TV. But in a few years, who knows?
The movie industry currently uses two different technologies for viewing 3D images: polarized glasses and shutter glasses. ZEISS cinemizer glasses are also another promising technology for 3D entertainment. But let's look at the other technologies first. With polarization technology, either vertical and horizontal light waves are transmitted, or circular waves are alternately transmitted clockwise and anti-clockwise. However, the two different filters of the 3D glasses pass only one type of light wave on each side. The right eye sees only the vertically polarized light and the left eye sees only the horizontally polarized light waves. When the brain processes the two images, we see in 3D. But because the glasses block out a lot of light, the monitor must continuously transmit very bright light.
Today, shutter glasses are another alternative. They're called shutter glasses because they work like a camera shutter. These 3D glasses feature liquid crystal lenses that alternately darken over one eye and then the other. This happens incredibly quickly, up to 300 times per second, depending on the make and model of the TV. The different images for the right and the left eye are projected on the screen in synchronization with the rapid-fire alternate opening and closing of the left and right eyeglass lens. There are also shutter glasses for watching 3D on a computer. The disadvantage: a flicker effect can be present under certain lighting, such as fluorescent lamps.
ZEISS cinemizers are unique 3D glasses. They simulate a movie screen at a distance of 6.5 feet. This movie screen effect is made possible by small LED monitors inside the glasses. The frames include headphones for movie sound. A unique feature of these 3D glasses is that they are also suitable for people who wear glasses. The prescription strength of an in-built lens can be adjusted from -5 to +2 within the 3D glasses. Versions are available for the iPod, iPhone, some mobile phones and PlayStation 3 gaming consoles. Cinemizers can also be used with your home DVD Blu-ray player.
For those with highly impaired vision, these glasses can also be worn under the cinemizer as long as it is comfortable for the user to do so.
It's important to know that not everyone is able to see three-dimensionally. This is especially common in people who are unable to see properly out of one eye. Sometimes, however, the brain is unable to process the two images correctly and combine them to create a proper 3D image. Our advice: not everyone experiences the 3D effect right away. Sometimes it takes a while for the brain to catch on. It's best to just try it and find out.
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