Why is it so?

A clear lens casts a black shadow. How?



We thought we’d post this picture we took during concept development of our upcoming blue light window display. So why is it that the spectacles and the large lens leaning at top left cast a black shadow but the two lenses at the bottom do not?

The savvy readers will already have figured out that it is due to the wavelength of the light from the globe, what the picture shows is some of our lenses as compared to a more basic offering on the market.

What does this tell us? Well, we used a UV lamp to illuminate the scene and our lenses are the ones that are casting the black shadow. This is because all of our lenses contain UV inhibitors, unlike the ones at the bottom left of the picture. So you can be sure that you are getting all the protection you need, every time.

How much extra does this cost? From us it doesn’t cost one cent more. We put top quality hard coated, UV blocking lenses in every pair of spectacles we make, so you can be assured you are getting the best quality, performance and protection.

At Hannaford Eyewear we know optics. Contact us to discuss your needs today.

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