All reviews are from people who have redeemed deals with this merchant.
· Reviewed January 31, 2017
· Reviewed January 6, 2017
What You'll Get
- $49 for eye exam and $150 towards a complete pair of prescription glasses ($269 value)
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.
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.
- 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 90 days after purchase. Amount paid never expires. Consultation required. Not valid with insurance. Appointment required. Limit 1 per person, may buy 1 additional as gift. Limit 1 per visit. All goods or services must be used by the same person. $150 credit is for prescription glasses only. Contacts are excluded. May be repurchased every 30 days. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.