Now that summer is upon us and we’re all spending more time outdoors, it’s good to remember that the eyes need protection from UV light. Since Ultraviolet light exposure is almost always greater at higher altitudes, and since Calgary is at a moderately high altitude (1,048 meters, or 3,438 feet), it’s even more important where we live.

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While you should choose sunglasses based on your needs and style, the adverse health effects of UV exposure make protection against harmful UV rays the priority. While glare can be bothersome, it does not lead to harmful health effects. You should seek out glasses that have both properties. At Doig Optometry, UV protection comes standard with every pair of sunglasses.

Ultraviolet light causes sunburns, so it’s no secret that ultraviolet rays can be harmful. It’s also no secret that too much exposure to ultraviolet light over time can cause changes in the skin and even skin cancer. But did you know that ultraviolet light can also affect your eyes? Studies have shown that prolonged exposure to UV rays can lead to:

How to make your glasses anti glare at home

Glare occurs when light waves from the sun or other sources reflect off a flat surface and become aligned in a horizontal pattern. This concentrated, intense light can be uncomfortable and harmful to the eyes, causing eyestrain and reducing visibility. Polarized lenses work by blocking these horizontally oriented light waves while still allowing vertical light waves to pass through.

Doig Optometrist offers a wide range of sunglasses with standard UV protection properties and polarization options for each pair. We have various styles and brands to meet all budgets.

The polarizing filter in the sunglasses lenses is usually a chemical film that is vertically aligned. When horizontally polarized light hits the filter, it cannot pass through, effectively reducing the amount of glare that reaches your eyes. Eliminating this horizontally polarized light enhances visual clarity, reduces eye strain, and improves overall comfort when dealing with intense light conditions.

Expert Tip: Polarized Lenses eliminate reflections from the surface of a puddle on the road, creating a risk for motorcyclists and cyclists. Elite golfers who judge the lay of the green by the reflection of the surface of the blades of grass will notice that this is more difficult to see while wearing Polarized Lenses that eliminate these reflections.

Glasses with UV protection should be clearly marked. Check for a label that indicates “100% UV Blocking”, or something similar. Glasses with a 100% UV protection or UV 400 label block both UVA and UVB rays. If you are still in doubt, ask the eyecare professional helping you choose your glasses. UV protection comes standard with every pair of glasses we sell at Doig Optometry.

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When choosing polarized sunglasses, make sure to get them from reputable brands and retailers to ensure the lenses effectively block glare and provide the intended benefits.

Today's modern anti-reflective coatings can virtually eliminate the reflection of light from eyeglass lenses, allowing 99.5 percent of available light to pass through the lenses and enter the eye for good vision.

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Light sensitivity comes from two sources: UV exposure and glare. Since there are negative health effects from Ultraviolet light exposure, all sunglasses sold in Canada must be UV-blocking by law. That’s not necessarily true at the swap meet on your tropical holiday, though. The good news is that UV Protection is part of every pair of Sunglasses purchased at Doig Optometry. We can also ensure that your clear eyeglasses are UV-blocking.

AR coatings are especially beneficial when used on high-index lenses, which reflect more light than regular plastic lenses. Generally, the higher the index of refraction of the lens material, the more light that will be reflected from the surface of the lenses.

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Most premium anti-reflective coatings include a "hydrophobic" surface layer that prevents water spots from forming and makes the lenses easier to clean. Some AR coatings also include an "oleophobic" surface layer that repels skin oils and makes it easier to remove smudges from the lenses.

UV protection must be put on your sunglasses at the time they are manufactured. Adding it to your sunglasses as an afterthought is just not done. If you bought your Polarized Sunglasses in Canada, then they likely already have UV protection. It’s just not legal to sell sunglasses without UV protection in Canada. If you would like the level of UV protection checked, Bring them to Doig Optometry and we can check them for you. If you have an ophthalmic quality sunglass frame, and you want to put new lenses in it, we can make sure your new lenses are UV blocking, Polarized, or both, according to your preference.

While the lens racks are rotating in the coating chamber, a power source within the machine focuses a beam of electrons onto a small crucible that contains a series of metal oxides in separate compartments. When bombarded by the beam of this electron "gun" in succession, the metal oxides are transformed into vapors that fill the coating chamber and adhere to the lenses in a specific order to form a precise multilayer AR coating.

Expert Tip: A common misconception about sunglasses is that they should only be worn in the sun, but it’s equally as important to wear sunglasses in the shade as UV rays reflected from other surfaces are also dangerous.

Some eyeglass lenses have factory-applied AR coating on both lens surfaces. Other lenses, particularly progressive lenses and other multifocal lenses (i.e., bifocals and trifocals), have the coating applied after the lenses have been customized to your eyeglass prescription by an optical lab.

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Applying anti-reflective coatings to eyeglass lenses is a highly technical process involving vacuum deposition technology.

Anti-reflective coatings are incredibly thin. The entire multilayer AR coating stack generally is only about 0.2 to 0.3 microns thick, or about 0.02 percent (two one-hundredths of 1 percent) of the thickness of a standard eyeglass lens.

Sunglasses labeled as providing 100% UV protection are equipped with lenses that block both UVA and UVB rays. The lenses contain special coatings or additives that filter out these harmful rays, preventing them from reaching your eyes and reducing the risk of eye damage and related issues.

By eliminating reflections, AR coatings also makes your eyeglass lenses look nearly invisible so people can see your eyes and facial expressions more clearly. Anti-reflective glasses also are more attractive, so you can look your best in all lighting conditions.

The visual benefits of lenses with anti-reflective coating include sharper vision with less glare when driving at night and greater comfort during prolonged computer use (compared with wearing eyeglass lenses without AR coating).

Expert Tip: Digital screens emit polarized light, so Polarized Sunglasses block out parts of the image and are not ideal for digital devices.

Polarized sunglasses are a type of eyewear specifically designed to reduce glare from surfaces like water, snow, glass, and other reflective surfaces. They achieve this by incorporating a special polarizing filter into the lenses.

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Calgary enjoys an average of 333 days of sunshine each year, totalling 2396 hours. That’s a lot of sunshine to make us feel light-sensitive! This highlights the importance of having adequate eye protection while we’re out enjoying the sunshine and warm weather.

Anti reflective glasses

Each AR coating manufacturer has its own proprietary formula, but generally all anti-reflective coatings consist of multiple microscopic layers of metallic oxides of alternating high and low index of refraction. Depending on the AR coating formula, most lenses with anti-reflective coating have a very faint residual color, usually green or blue, that is characteristic of that particular brand of coating.

Also, don't attempt to clean AR-coated lenses without wetting them first. Using a dry cloth on a dry lens can cause lens scratches. And because anti-reflective coating eliminates light reflections that can mask lens surface defects, fine scratches often are more visible on AR-coated lenses than on uncoated lenses.

For example, regular plastic lenses reflect roughly 8 percent of light hitting the lenses, so only 92 percent of available light enters the eye for vision. High index plastic lenses can reflect up to 50 percent more light than regular plastic lenses (approximately 12 percent of available light), so even less light is available to the eye for vision. This can be particularly troublesome in low-light conditions, such as when driving at night.

The width and height of lenses do not affect the ability of the lens to block ultraviolet rays, but larger lenses give you better coverage so less sunlight can get to your eyes and face around the sunglass frame.

Anti-reflective coatings (also called AR coating or anti-glare coating) improve both your vision through your lenses and the appearance of your eyeglasses.

The lenses are then loaded into special metal racks with spring-loaded openings so the lenses are held securely but with virtually all lens surfaces exposed for the coating application. The racks are then loaded into the coating chamber. The door of the chamber is sealed, and the air is pumped out of the chamber to create a vacuum.

Sunglasses with 100% UV protection are designed to block 100% of harmful ultraviolet (UV) rays from the sun. These rays are invisible to the naked eye and can be damaging to both the eyes and the skin. There are three types of UV rays: UVA, UVB, and UVC.

Since there are no negative health effects from glare, there’s no legal requirement that your sunglasses eliminate glare. Patients who still experience light sensitivity in their UV-blocking sunglasses sometimes think that their sunglasses aren’t dark enough. However, it’s more likely that the remaining light sensitivity is actually glare sensitivity, which can be eliminated with a quality pair of polarized sunglass senses.

The first step in the AR coating process is to meticulously clean the lenses and inspect them for visible and microscopic surface defects. Even a tiny smudge, piece of lint or hairline scratch on a lens during the coating process can cause a defective AR coating.

When cleaning AR-coated lenses, use only products that your optician recommends. Lens cleaners with harsh chemicals may damage the anti-reflective coating.

Polarized sunglasses are particularly popular among outdoor enthusiasts, such as fishermen, boaters, skiers, and drivers, as they help to provide a clearer view of their surroundings and improve safety. However, it's essential to note that polarized sunglasses may not be suitable for certain activities, such as viewing LCD screens or some instruments, as the polarization can interfere with these displays.

UV-blocking sunglasses protect your eyes from dangerous ultraviolet rays and are crucial to good eye health. Polarized sunglasses can make your eyes more comfortable by eliminating glare. Whether you are deciding between simple UV-blocking sunglasses or Polarized Sunglasses, one of our friendly and helpful team members will help you find the best lenses for you. See Sharp, Look Sharp, Love Your Glasses®!

Both benefits are due to AR coating's ability to eliminate reflections of light from the front and back surface of eyeglass lenses.

Two types of sunglasses are 100% UV protection and polarized sunglasses. In this article, we address the important differences between the two.

Typically, a production line includes multiple washing and rinsing baths, including ultrasonic cleaning to remove any traces of surface contaminants. This is followed by air drying and heating of the lenses in special ovens to further remove unwanted moisture and gases from the lens surface.