Sunglasses FAQs

Frequently Asked Questions About Sunglasses at Eyes On Henry

As the summer heats up and people spend more time outdoors, sunglasses start showing up everywhere. But are these sunglasses really protecting their owners' eyes, and what kinds of sunglasses are best for you? Here are the answers to some frequently asked questions on the subject at Eyes On Henry.

Two women driving through the city

What is UV, and why is it so harmful?

"UV" stands for ultraviolet, a range of radiation emitted by light sources such as the sun. The two types of UV radiation that reach our planet, UVA and UVB, can both pose serious health hazards including eye and vision problems.

How does UV exposure threaten my eyes?

Acute UV exposure may cause photo keratitis, or "snow blindness," in which the eye's surface is actually sunburned. UV rays can also contribute to cataracts, macular degeneration, and cancer of the tissues in and around the eyes (such as the eyelids).

Do darker sunglasses block more UV?

Contrary to what many people assume, the darkness of a sunglass lens has nothing to do with UV protection; it only blocks visible light. That's why buying no-name brands at the local store can be a bad idea, since you don't know what you're really getting.

How do I know my sunglasses provide proper UV protection?

You need to buy sunglasses that have been rated UV 400. This designation means that the lenses are guaranteed to block 90 to 100 percent of UV rays. Our clinic's sunglasses offer this level of protection.

How much visible light should a pair of sunglasses filter?

Because blinding glare from visible light can pose potential hazards of its own, you'll want to select lenses that block 75 to 90 percent of visible light. You should also make sure the lenses block most frequencies of HEV (high energy visible) light in the blue-violet part of the spectrum, a potential macular degeneration trigger.

What other special features can I get for my sunglasses?

You can get more than just a stunning selection of designer frames and lenses that block UV/HEV here at Eyes On Henry.  We also offer a variety of tint colors, frame sizes and shapes, scratch-resistant coatings, and polarized lenses that block the glitter of reflected light from water, snow and sand.

Get More Answers at Our Spartanburg Office

Once you have all the answers to your sunglass questions, you'll be able to relax and truly enjoy the great outdoors. Call Eyes On Henry at (864) 585-0208 to learn more and arrange for a visit to our Spartanburg optical department. We know you'll like what you see!


Find us on the map

Office Hours

Our Regular Schedule


7:00 am-7:00 pm


8:15 am-5:45 pm


9:00 am-5:45 pm


8:15 am-5:45 pm


By Appointment






Reviews From Our Satisfied Patients

  • "You all do an awesome job and I feel very welcomed there. I will continue to come back because all of you are so friendly and helping."
    A.S. - Spartanburg, SC
  • "I was notified that my glasses were ready for pick up. I went to the office without an appointment and the receptionist directed me to the appropriate area. I received my glasses, had a minor adjustment made by the technician, and was out the door 10 minutes after arriving! Great staff and great service."