Eyes problems and eye glasses

Eyes problems and eye glasses

Eyes problems and eye glasses

Eye glasses are some of the most widely used devices for vision correction. But how do they work? On the whole, they are composed of lenses and frames. The lenses are designed in curved shape, so as to allow light reflected by them can be well focused on the retina. And all the information will be delivered to the optic nerve, which is connected to brain- this is how people can see. Anyway, the curved light must be reduced to some extent, so as to make sure that it can be focused on retina properly.

The structure of eye is just the same as a camera, which is designed according to eye. A transparent object, lens, is set in the window of eyes, namely between the pupil and the retina. All these light can be well reflected onto retina via the lens. However, if there is some problems in the reflecting, in that the images can not be focused onto the retina and some vision problems may occur. And people will suffer from blurriness. For this, some optical devices are needed, which can adjust the reflection to a proper position.

On the whole, the problem in the focus can be fallen into two types, either too much or insufficient. This leads to the emergence of two different glasses. The glasses lenses can be plus or minus, so as to adjust the coming angle of light properly. Convex and concave shapes are just the special designs of the two lenses. And how much can be light be adjusted is also determined by the strengths of these lenses.

If you want to know more about vision knowledge, then feel free to visit http://vision.firmoo.com/eye-diseases

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