explain the lens arrangement on varifocal glasses?

Question

I mean the distance vision area and the magnification area for reading?

Answer 1

The distance portion is mainly in the top and as you look down (centrally down) you are getting progressively more power for near work. The areas to the side of the near portion are sometimes referred to as "no man's land" because they are not good to look through. When you look down try not to look through the outside - the near portion is actually usually a little nasal because our eyes turn in when we look down.
I'm not sure that answered your question well but I hope it is somewhat helpful.

Answer 2

Progressive lenses
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Progressive lenses, also called progressive addition lenses, progressive power lenses, graduated lenses and varifocal lenses, are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation. A gradient of increasing lens power is added to the correction for the other refraction error, going from a minimum or nothing at the top of the lens to maximum magnification at the bottom of the lens. A wearer can then adjust the lens power required for clear vision at different viewing distances by tilting his or her head to place the line of sight through different parts of the lens.

Progressive addition lenses avoid the discontinuities in the visual field created by bifocal and trifocal lenses. The lenses are also more cosmetically attractive. The lenses suffer the disadvantage of creating regions of aberration away from the optic axis, yielding poor visual resolution. Although manufacturers are constantly striving to minimize these distortions, some wearers cannot tolerate the lenses.

Essilor laid a strong claim to have invented varifocals in 1958 with their first design of Varilux lens[citation needed]. Early varifocals were relatively crude designs but modern sophisticated varifocals have gained much greater patient acceptance and include special designs to cater to many separate types of wearer application, for example lenses may be customized for use with computers, or to offer enlarged near and intermediate view areas.

Answer 3

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Regards

Answer 4

Ehm..
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Have a nice day

Answer 5

distance is at the top and reading at the bottom but there is variation between the two