How do glasses work?

Nowadays, glasses can be used in many cases. These can be glasses for improving vision, in case of hyperopia or nearsightedness. Points are also required for viewing 3D. There are other uses for glasses.

Vision improvement

The eyes are one of the most important human organs. A person suffers from the fact that he does not see or poorly sees surrounding objects.

If a person sees poorly the surrounding objects, objects, then this person suffers from myopia. To see objects, one has to squint his eyes in order to reduce the amount of light falling on the retina. One of the ways to improve eyesight is glasses

How do glasses work in this case? In these glasses are used diffusing lenses that turn parallel rays into diverging, contributing to the movement of the focus of light rays on the retina of the eye.

When farsightedness is used bulging glasses that focus the object on the retina, and not on the plane behind it. With age-long-sightedness, the lens thickens, becoming less flexible, cannot refract the rays so that they converge on the retina.

There are people who need glasses at the same time for close and long distances. It is inconvenient to wear two glasses, in this case use combined (bifocal) glasses. Such glasses consist of two halves of glasses: the upper one for distance, and the lower one for close range.

Useful for eye training glasses. They artificially reduce the diameter of the pupil and the level of illumination, the light passes through the central optical zone of the eye, leading to a decrease in light scattering on the retina of the eye, increasing the clarity of the image of the object.

3D movies

Since 2010, began the production of three-dimensional Full HD TVs. In the field of volumetric films, IMAX 3D and ReaID 3D technologies are used.

Many of course wondering how the 3D glasses work. IMAX 3D uses 2 high power film projectors. They project on the screen an image for the right and left eye, polarized in the horizontal and vertical planes.

On the glasses of these stereoscopic glasses there are light filters that let in their strictly polarized light and a person begins to perceive the object from different angles, seeing a three-dimensional image. With this technology, 3D images are viewed on large screens.however, if you tilt your head slightly to the side, the image is split, it loses its brightness, and the stereoscopic effect may completely disappear.

With ReaID 3D technology, one digital projector is used, which alternately projects with high purity frames for each eye.

This is how 3D glasses work in this technology. The glasses here are applied on the right and left glass with opposite circular polarization. Due to this, each eye, regardless of the inclination of the head, sees its own picture.

ReaID 3D technology delivers the more natural colors of a three-dimensional image. However, there is a disadvantage of this technology - it is the loss of brightness, so ReaID 3D is used in small cinema halls.

To watch 3D TV, special microchip glasses with alternate dimming of light filters are used. The TV has a built-in unit that sets the sequence for darkening the right and left glasses, allowing the eyes to see what is intended for them.



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