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Thursday, 23 August 2012

Vision Without Glasses Review - Types of progressive lenses

Types of progressive lenses
In a normal human eye, the increased power when the object is moved close to the eye. The power increase is due to the accommodation of the lens of the eye. Housing is an automatic adjustment of the focal length of the lens. In
bifocal and trifocals, although the clarity of vision is achieved, the performance gains in distinct stages of the remote distance and near miss also the adaptation process. But progressives are such that the property can be adapted to any distance in the eyes of a person develops. Such a lens is. Developed by Bernard Maitenaz 1959 and the Varilux was when the nettle According to this model, lentils multidesign were many. These include Sola Percepta, Kodak and AO Essilor lenses and adaptation.

What are progressive lenses?

                                                                       That are based on removing the cover, namely the extent, intermediate and classified in the neighborhood. In this addition lens near (the variation of the energy at intervals close) by a canal 12 mm that is similar to the lens. If nearest is large and the size of the pupil is large, should not the person lenses and also avoid work permanently in places where the wide field of view is required. Vision Without Glasses Review Few things should be kept in mind while choosing the framework to be discussed below.
Ideally, the mounting height of the frame 24 mm.
The forward inclination (tilt) of the chassis should be 7 to 9 degrees.
The frame must be short glass eye.
These lenses are divided into two broad categories of lenses. These are:
Rigid lenses: this lens type, the rate of change of power and the level of astigmatism is high.
Soft lenses: The level of astigmatism in a soft lens is small and the distance of the lens is small compared to rigid lens.

Different types

Prime Lens: These lenses are grounded digital and provide a clear and undistorted. These lenses are called lenses means "free-form design."

Standard lens: In these lenses, a large area on the surface of the lens, which is suitable for playback.
Target computer: These lenses offer the range of 16 inches to 6 feet. Vision Without Glasses This lens is also known as office purpose because it is near variable focus, which is specially designed for official use characteristics. It is ideal for people who work with computers for a few hours long and continuous.

Wide corridor: The range through these lenses are large and can be used on a large scale.
Short corridor lens: short corridor lenses are able to integrate into a small frame. The distance between the intermediate portion and the near portion of the lens is small.

Polarized Lens: This type of lens has been designed to protect the eyes against the bright sunlight. Polarized lenses are very comfortable and essentially act as a shield for our eyes.
Objective transition: These lenses are clear indoors and darken when exposed to sunlight.

Lens high index: The index ranges from 1.67 to 1.74, and the lenses are thin and lightweight.

Mid-mark of the lens: The index ranges from 1.56 to 1.60 and it is thinner than the other goals.

Trivex Lens: These are high quality optical lenses with shock resistance.
Progressive lenses are glass, plastic, polycarbonate, etc. made readers can vary the strength of focus by tilting the head and viewed through a certain range of the lens. These lenses are free of splits which give a more youthful appearance to those who designed the bear. However, the cost of the lenses are higher than bifocal and other single vision lenses.

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