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AR Coating Photochromic Adaptive Lenses Flat Top 1.56 Index Far / Near Vision
Home » Products » Photochromic Lens » 1.56 Photochromic Lens » AR Coating Photochromic Adaptive Lenses Flat Top 1.56 Index Far / Near Vision
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AR Coating Photochromic Adaptive Lenses Flat Top 1.56 Index Far / Near Vision

  • 1.56 Photochromic FT-28 HMC
  • Aogang
  • 1.56 Photochromic FT-28 HMC
  • 1.56
  • 70MM
  • NK55,imported from Japan
  • 38
  • 1.21
  • 97%
  • HMC/AR/Anti-Reflective
  • SPH:-300~+300, ADD:+100~+350
Quantity:

Product Description


TransmissionDiameterRefractive indexAbbe valueSpecific Gravity
98%70mm1.56381.21
CoatingPhotochromicPower rangePlace of originBrand
HMCGrey/BrownSPH:000~+300,000~-300,CYL:+100~+350ChinaAogang


Feature

1) What is the 1.56 Photochromic Flat-top lens.

 

Photochromic: 

Photochromic lenses are eyeglass lenses that are clear (or nearly clear) indoors and darken automatically when exposed to sunlight. Other terms sometimes used for photochromic lenses include "light-adaptive lenses" and "variable tint lenses."

 

Flat-top:

Flat-top lenses were used to correct two different eye prescriptions. Bifocals were easy to spot - they had a line dividing the lens in two, with the upper half for distance vision, and the lower half for reading. 

Uncoated Photochromic Adaptive Lenses Flat Top 1.56 Index Far / Near Vision

 

2) How the photochromic work?

 

 

Uncoated Photochromic Adaptive Lenses Flat Top 1.56 Index Far / Near Vision

 

The molecules responsible for causing photochromic lenses to darken are activated by the sun's ultraviolet radiation. Because UV rays penetrate clouds, photochromic lenses will darken on overcast days as well as sunny days.

Photochromic lenses typically will not darken inside a vehicle because the windshield glass blocks most UV rays. Recent advancements in technology allow some photochromic lenses to activate with both UV and visible light, providing some darkening behind the windshield.

 

Uncoated Photochromic Adaptive Lenses Flat Top 1.56 Index Far / Near Vision

3) Why choose the Flat-top?

 

Bifocals have two different lens powers that aid in seeing objects at various distances once the aging process reduces your ability to do so. These are usually prescribed to adults older than 40 years, although some children and younger adults may also need them for focusing problems, which strain the eyes while reading.


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


Power range

Uncoated Photochromic Adaptive Lenses Flat Top 1.56 Index Far / Near Vision

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