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Far / Near Vision 1.5 Progressive Lens Blank , CR39 Progressive Eyeglass Lenses
Home » Products » Semi Finished Lens » SF 1.499 Lens » Far / Near Vision 1.5 Progressive Lens Blank , CR39 Progressive Eyeglass Lenses
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Far / Near Vision 1.5 Progressive Lens Blank , CR39 Progressive Eyeglass Lenses

  • SF 1.499 Progressive HMC
  • Aogang
  • SF 1.499 Progressive HMC
  • 1.499
  • 75/14&17
  • NK55,imported from Japan
  • 58
  • 1.32
  • 97%
  • HMC/AR/Anti-Reflective
  • Base:2/4/6/8 ADD:+100~+350
Quantity:

Technical Data

 

 CR-39 Semi Finished Progressive(14mm) Lens

 Material: CR-39 Index Resin(Ne=1.499, Abbe=58, Specific Gravity=1.32)

 Add Power: +1.00 to +3.50 in 0.25D steps

 Corridor Lenghth=14mm

 

CONVEX SURFACECONCAVE SURFACE


Mominal CurveActual Curve

Sag

(sagitta: 40mm)

Sag

(sagitta:50mm)

RadiusRadiusCT(mm)ET(mm)Dia(mm)
2.002.681.071.67185.95126.5010.512.575
4.004.041.612.52123.5383.009.813.2
6.006.012.403.7883.0383.0010.711.0
8.007.342.944.6568.0083.0012.4

10.0

 

Add Prism(Down):

 

ADD1.001.251.501.752.002.252.502.753.003.253.50
Prism0.660.830.991.161.321.491.651.821.982.152.31

 

Prescription Range:

 

Nominal Base CurveRecommended Diopter in BaseCylinder
2.00-10.00 to -4.250~-6.00
4.00-4.00 to +2.000~-6.00
6.00+2.25 to +4.500~-6.00
8.00+4.75 to +7.000~-6.00

                  


Features

Semi finished lens:

 


Far / Near Vision 1.5 Progressive Lens Blank , CR39 Progressive Eyeglass Lenses

◆ The definition of a semi-finished lens

 

Semi-finished lenses is the most primitive state of the lens, the customer can buy finished semi-finished lenses according to the required degree of finished lenses to polish, so only semi-finished lenses camber, there is no degree. Different prescription powers request for different semi-finished lens types or base curves.

 

◆The process of semi finished lens

 

The starting point for freeform production is a semi-finished lens, also known as a puck due to its resemblance to an ice hockey puck. These are produced in a casting process that is also used to manufacture stock lenses.

 

Progressive lens:

 

A progressive lens gives you three vision powers in one seamless lens for a more natural and flattering way to see your world. If you need more than one lens strength to read, do computer work or drive, progressives let you can see clearly at any distance with one pair of glasses. You simply adjust your head position to see three ranges of distance. Bring your head up to see far away; look straight ahead for mid-range vision, and point your nose down to read or do close-up work, like texting.

Far / Near Vision 1.5 Progressive Lens Blank , CR39 Progressive Eyeglass Lenses

 


Tips

 Like anything new, adjusting to progressives can be frustrating, but don’t worry. Here are a few tips that’ll have you seeing clearly all the time, at every distance, with one pair of glasses.

 

Far / Near Vision 1.5 Progressive Lens Blank , CR39 Progressive Eyeglass Lenses

• Resist the temptation to switch back and forth to your old glasses—this slows down the process of retraining your brain to focus through new lenses.

• Wear your glasses high on your nose, and close to your eyes to maximize the range of visibility through each lens.

• Move your head, not your eyes. Point your nose directly at what you’d like to see and bring it into focus by moving your chin up or down.

• Practice! Grab a magazine to read while watching TV. Going back and forth between the two is a great way to practice and to speed up your transition.


Coating

Far / Near Vision 1.5 Progressive Lens Blank , CR39 Progressive Eyeglass Lenses

 

 

The most important benefits of anti-reflective (AR) coating may be the unseen advantage–relief from fatigue and eyestrain caused by glare. AR does have a big cosmetic advantage, but removing the distracting reflections and ghost images that contribute to eyestrain clearly is a bigger benefit. Being more comfortable in anything we do is a benefit, especially when wearing glasses.

 


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