C$30 for C$170 Off a Complete Pair of Prescription Eyeglasses or Sunglasses at Mason Opticians

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Up to 82% Off

Customer Reviews

6 Ratings

Very personable and helpful clerk. Large selection of frames
Karen B. · August 24, 2017

What You'll Get


The Deal

  • C$30 for C$170 toward a complete pair of prescription eyeglasses or sunglasses

Transitional Lenses: Instant Shade for Your Eyes

Doing away with the burden of swapping prescription glasses for a blindfold every time the sun comes out, transitional lenses—more accurately known as photochromic lenses—almost seem like magic. Indoors, the lenses are clear, but outside, they darken as if transforming into a separate pair of sunglasses, shading your eyes from seeing the sun in its bathrobe.

Shady Science

The keys to the transition are the UV rays of natural light. In glass lenses, the glass is embedded with crystals of silver chloride or silver halide. When exposed to UV rays, the crystals combine with the glass molecules, forming elemental silver, which appears dark compared to the clear glass. These days, however, most photochromic lenses are made of plastic. Instead of silver molecules, the lenses use an organic dye. UV rays break the chemical bonds, causing the molecules to rearrange into a form that absorbs the visible wavelengths of sunlight.

Bonus Points

  • The Corning Glass Company—notable today for producing the durable glass on smartphones—invented the first photochromic lenses in 1960.
  • Many photochromic lenses don’t work while driving, since car windows filter out UV light. Ask your optician about alternative transitional-lens options that do work inside vehicles or spaceships headed toward the sun.

The Fine Print


Promotional value expires 120 days after purchase. Amount paid never expires. Limit 1 per person, may buy 1 additional as gift. Limit 1 per visit. Must use promotional value in 1 visit. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

About Mason Opticians


By purchasing this deal you'll unlock points which can be spent on discounts and rewards. Every 5,000 points can be redeemed for $5 Off your next purchase.