Some knowledge of bifocals. EH83222

Written by Optician Club on . Posted in Eyeglasses Frames

Optician Knowledge:
Q: Some knowledge of bifocals.

A: Here is some knowledge of bifocals. When measuring for seg heights, always remember that you simply lose about or at least 1mm as a result of eye wire, with the exception of rimless, or semi rimless frames. This can be more important, and in all likelihood is to use your progressive wear lenses.

With a line bifocal, when you measure 20 high, it will be easy to utilize at the least 19mm. Which has a progressive when there is 10mm of actual full power segment, maybe you have only 9mm, as well as in short corridor progressives, situation may be worse.

Thus this is the reason i love to fit progressives with a B measurement of believe it or not then 27mm. thus i came up with a trifle rhyme.

27 could be heaven
28 may well be great
29 is mighty fine

Product Info



  • Model No: EH83222
  • Highlight: Latest Fashion Style
  • Gender: Woman’s Eyewear
  • Age Group: Adults
  • Frame Size: 51-17-135
  • Shape: Rectangle Eyewear
  • Spring Hinge: No
  • Color: Black Outside And White Inside
  • Available Color: Brown Outside And White Inside
  • Material: Acetate
  • Tips: No
  • Bridge: Unadjustable nose pads
  • Original: ShenZhen
  • Rim: Full-Rim Spectacle
  • Certificate: CE and FDA are certificated

Sales Info:

Shipping Info:

  • Package: 1pcs/Poly-bag, 12pcs/Inner Box, 300PCS/Carton
  • Carton Box Size: 84*27*31
  • Cross Weight: 12KGS
  • HS Code: 90031900
  • Delivery Time: Within 7 days upon received your payment


Tags: , , , , ,

Optician Club

Dedicated to Independent Optometrists and Opticians. Make you benefit from China eyeglasses manufacturing while minimizing investments and risks.