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1.56 Round-top AR Coating Semi Finished Lens Blanks In Multi Purpose Lens
Home » Products » Semi Finished Lens » SF Bifocal Lens » 1.56 Round-top AR Coating Semi Finished Lens Blanks In Multi Purpose Lens
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1.56 Round-top AR Coating Semi Finished Lens Blanks In Multi Purpose Lens

  • Semi Finished Bifocal
  • Aogang
  • 9001509900
  • 1.56
  • 70/28mm
  • NK55, imported from Japan
  • 38
  • 1.28
  • > 97%
  • UC, HC, HMC
  • Base: 2/4/6/8 ADD; +1.00~+3.50
Quantity:

Technical Data

1.56 Semi Finished Round Top Bifocal Lens Blanks

Material: 1.56 Index NK55 Resin

(Ne=1.549, Abbe=38, Specific Gravity=1.28)

Segment Placement: 5mm down -5mm in

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

Segment Size: 28mm

Semi Finished 1.56 Index Lenses Round Top AR Coating 42 Abbe Value

 

Diameter(mm) Nominal
Curve
Front
Radius
T.C Back
Radius
BACK
T.C
CT/ET Frong sag
Ring 50mm
RX Range
Recommended
ɸ70 200B 260.199 2.04 94.93 5.58 10.0/14.0 1.20 -4.25Dto-8.00D
ɸ70 400B 127.62 4.15 94.93 5.58 6.0/8.0 2.47 +2.00Dto-4.00
ɸ70 600B 87.18 6.08 161.04 3.29 9.0/6.0 3.66 0.00Dto+4.00D
ɸ70 800B 66.49 7.97 161.04 3.29 13.0/6.0 4.88 -4.25Dto+6.00D


Product Features

Some time after age 40, you will begin to notice the symptoms of presbyopia, including that feeling that your arms "aren't long enough" to hold a newspaper or magazine at a position where you can read it clearly.

 

If you already wear prescription eyeglasses, this generally means you will need to begin wearing bifocal lenses, such as round top bifocals to continue to see clearly at all distances.

 

Semi Finished 1.56 Index Lenses Round Top AR Coating 42 Abbe Value

 

  • One Lens, Many Functions


Round-top bifocal eyeglass lenses contain two or more lens powers to help you see objects at all distances after you lose the ability to naturally change the focus of your eyes due to age (presbyopia).

 

  • Suitable not only elderly, but also children and young aldults


Though RT bifocal lenses usually are prescribed for adults over age 40 to compensate for presbyopia, in some cases bifocals are prescribed for children and young adults who have eye teaming or focusing problems that cause eye strain when reading. In these cases, the bottom portion of the bifocal lens reduces the amount of focusing effort required to see near objects clearly.

 

Contact Us

contact us

QUICK LINKS

CONTACT

Add: East Of Nongganxiao, Situ Town, Danyang City, Jiangsu Province, China

Tel:+86-511-86550315
Phone No: +86 18796035231
Fax: +86-511-86555316
Email: admin@ag-optical.com.cn
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