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Round Top Bifocal Spectacle Lens Blanks , CR39 1.499 Uncoated Optical Lens Blanks
Home » Products » Semi Finished Lens » SF Bifocal Lens » Round Top Bifocal Spectacle Lens Blanks , CR39 1.499 Uncoated Optical Lens Blanks
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Round Top Bifocal Spectacle Lens Blanks , CR39 1.499 Uncoated Optical Lens Blanks

  • Semi Finished Bifocal
  • Aogang
  • 9001509900
  • 1.499
  • 70/28mm
  • CR39
  • 38
  • 1.28
  • > 97%
  • UC, HC, HMC
  • Base: 2/4/6/8 ADD; +1.00~+3.50
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Technical Data

1.499 S/F ROUND TOP BIFOCAL BLANKS

MARTERIAL REFRACTIVE INDEX=1.499                                                                                                                        TOOLING INDEX=1.530
Diameter(mm)Nominal
Curve
Front
Radius
T.CBack
Radius
BACK
T.C
CT/ETFrong sag
Ring 50mm
RX Range
Recommended
ɸ70200B260.1992.0494.935.5810.0/14.01.20-4.25Dto-8.00D
ɸ70400B127.624.1594.935.586.0/8.02.47+2.00Dto-4.00
ɸ70600B87.186.08161.043.299.0/6.03.660.00Dto+4.00D
ɸ70800B66.497.97161.043.2913.0/6.04.88-4.25Dto+6.00D


Bifocals in General

Round Top Bifocal Spectacle Lens Blanks , CR39 1.499 Uncoated Optical Lens Blanks

RT-28 in bifocals

 

  • One of the most popular fused bifocal today has a round-shaped on the bottom of the lens, and they called round-top bifocals

 

  • Round top bifocals are further described by the width of the near segment, measured in millimeters (mm). The most popular RT bifocal is the RT-28, a round top bifocal with a near seg that is 28 mm wide.

 

Bifocal lens can be called a multi purpose lens. It has 2 different fields of vision in one visible lens. The larger of the lens usually has the prescription necessary for you to see for distance. However, this can also be your prescription for computer use or intermediate range, as you would normally be looking straight when you view through this particular part of the lens. The lower part, also called the window, typically has your reading prescription. Since you generally look down to read, this is the logical place to put this range of vision assistance.

 

   Advantages of round-top bifocals


1. The wearers can see the near things by the round shape and see the distance things by the rest of the lenses.


2. The wearers don't need change two different visions glasses when they both reading book and watching TV.

3. The wearers can keep the same posture when they look both the near thing or far thing.

Round Top Bifocal Spectacle Lens Blanks , CR39 1.499 Uncoated Optical Lens Blanks

 

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