Alvarez lens technology


What is it

Our universal, variable focus spectacle makes use of the Alvarez principle, allowing a single pair of glassses to correct almost all cases of near- or far-sightedness. It adjusts like a pair of binoculars.

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How does it work

It's as simple as turning a dial. Turn the left dial to adjust the strength of the left lens; turn the right dial to adjust the strength of the right lens. 

FocusSpecs® correct presbyopia (‘old eyes’) and hyperopia (far-sightedness) with a power range of +0.5 to +4.5 dioptre, and myopia (near-sightedness) at a range between -1.0 and -5.0 dioptre. With this extensive range, FocusSpecs® are effective for up to 90% of all refractive errors. (N.B. FocusSpecs® do not correct astigmatism.)

The principle

Each lens consists of two inversely-shaped optical elements, placed exactly behind one another. The strength of each lens changes by shifting the two elements relative to each other.

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 USA PATENT NO. 7,980,690

USA PATENT NO. 7,980,690


Specifications

FRAME

  • Available in 3 standard colours
  • Angle between frame and sides: 80°
  • Suitable for head width: 100-160 mm
  • Weight: 20 grams
  • ISO 8980-1, 8980-4, 12870, 21987
  • 100% recyclable

AR/AS coating

  • Single layer dip coating
  • 80% reflection reduction
  • Scratch resistant

 

Lenses

  • Alvarez optics in clear and tinted Polycarbonate (PC)
  • MINUS power range: -1.0 to -5.0 dpt
  • PLUS power range: +0.5 to +4.5 dpt
  • Oval optical field: 36 x 26 mm
  • Pupillary distance: 61 mm
  • Radius: 170 mm

Mechanism

  • Easy adjustment mechanism
  • Linear adjustability
  • Independent control of each lense

 


Collection

 FocusSpecs Black

FocusSpecs Black

 FocusSpecs Brown

FocusSpecs Brown

 FocusSpecs Burgundy

FocusSpecs Burgundy

 FocusSpecs Sun

FocusSpecs Sun