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1.56 FT-28 Antireflective Lenses Blanks , Bifocal Vision AR Coated Lenses Blank
Home » Products » Semi Finished Lens » SF Bifocal Lens » 1.56 FT-28 Antireflective Lenses Blanks , Bifocal Vision AR Coated Lenses Blank
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1.56 FT-28 Antireflective Lenses Blanks , Bifocal Vision AR Coated Lenses Blank

  • SF 1.56 FT-28 HMC AR
  • Aogang
  • SF 1.56 FT-28 HMC AR
  • 1.56
  • 70MM
  • NK55,imported from Japan
  • 42
  • 1.25
  • 97%
  • HMC/AR/Anti-Reflective/Green/Blue
  • Base:2/4/6/8 ADD:+100~+350
Quantity:

Technical Data

  1.56 Semi Finished Photochromic FT-28 Lens 

  Material: 1.56 Index Resin(Ne=1.56, Abbe=43, Specific Gravity=1.14)

  Segment Placement=5mm down~5mm in

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

  Segment Size=28mm

1.56 FT-28 Antireflective Lenses Blanks , Bifocal Vision AR Coated Lenses Blank

 

CONVEX SURFACE CONCAVE SURFACE


Mominal Curve True Curve

Sag

(sagitta: 40mm)

Radius Radius CT(mm) ET(mm) Dia(mm)
1.549
2.00






70
4.00 4.17
1.50 131.74 132.50 8.0 8.0
6.00 6.35
2.30 86.45 88.80 8.0 7.0
8.00






 


Features

Semi finished lens:

 

What is the semi finished lens?

 

1.56 FT-28 Antireflective Lenses Blanks , Bifocal Vision AR Coated Lenses Blank

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. The semi-finished lenses are produced in a casting process. Here, liquid monomers are first poured into moulds. Various substances are added to the monomers, e.g. initiators and UV absorbers. The initiator triggers a chemical reaction that leads to hardening or "curing" of the lens, while the UV absorber increases the UV absorption of the lenses and prevents yellowing.

 

FT-28 optical lenses:

 

FT-28 offers a wide field of forward vision and allows the user to see objects at close range without changing spectacles. This lens gives the wearer a wide range of long-distance vision and, at the same time, allows viewing of objects at close range such as meters, navigation screens and expressway tickets. This type can also be used for sports such as golf.

 

1) The most popular fused bifocal today has a D-shaped near segment rotated 90 degrees so that the flat part of the "D" is facing up. For this reason, D-seg bifocals also are called "flat-top" (FT) or "straight-top" (ST) bifocals.

 

2) This is a D segment bifocal lens. It has the benefit that the optical centre of the near vision part of the lens i.e. the part of the reading area which gives the very best vision, is situated at the top of the reading portion. Also the widest part of the reading area is just below the dividing line, and is the part of the lens the wearer would use.

1.56 FT-28 Antireflective Lenses Blanks , Bifocal Vision AR Coated Lenses Blank

 


Coating

The coating used and the curved nature of lenses mean that up to 10% of light can be lost through reflections at the lens surfaces, these reflections can be distracting and appear unattractive.

By adding a coating it allows around 99% of light through the lens resulting in increased visual comfort and performance.

 

1.56 FT-28 Antireflective Lenses Blanks , Bifocal Vision AR Coated Lenses Blank


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