Anti-glare (AG) or anti-reflective (AR) lens coatings are specific coatings designed to decrease the amount of reflective light in your lenses. These coatings can be applied to the back, front, or both sides of your lenses to control the amount of light that enters your eyes.

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When you buy a pair of glasses, you should consider the many benefits coated lenses have to offer. During your next eye exam, talk to your eye doctor about what AG and AR coatings can do for you during your next eye exam.

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These two layers protect your lenses and control the amount of light that passes through to give you the most accurate view possible.

* Focal length in ( ): equivalent focal length when mounted on interchangeable-lens digital cameras with 35 mm full-frame sensors

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Focal length, or focal length range in the case of zooms, will usually be the foremost consideration when choosing a lens for a specific photograph or type of photography. The focal length of a lens determines two characteristics that are very important to photographers: magnification and angle of view.

AG and AR coatings eliminate almost all reflections from the surfaces of your lenses. Without these reflections, more light can pass through, which can increase your vision.

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AG and AR coatings are not just for glasses. In fact, the technology was created to improve the view of telescopes, microscopes, and camera lenses.

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The focal length of a lens is defined as the distance from its secondary principal point to its rear focal point when focus is set to infinity. The secondary principal point is one of six "cardinal points" that are used as points of reference in an optical lens (front and rear focal points, primary and secondary nodal points, and primary and secondary principal points). There's no predefined location for the secondary principal point in a compound lens—it could be somewhere inside the lens barrel or at some point outside the barrel, depending on the design of the lens—so there's no easy way to accurately measure the focal length of a lens yourself.

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If you decide to get lenses with a special coating, there are additional steps you have to take to take care of them. We recommend the following care steps when dealing with coated lenses:

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There are multiple types of lenses that feature AG and AR coatings. Some of the popular types of lens options that come with AG and AR coating options include:

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With newer technology, more and more people are discovering the benefits of anti-glare and anti-reflective lens coatings.

An appointment with your eye doctor can help determine the type of lenses and lens coatings are right for you and your lifestyle. Looking for a pair of non-glare glasses? Visit Park Slope Eye in Brooklyn.

AG and AR coatings offer many benefits and are definitely worth the extra cost, especially if you find yourself bothered by glare. They can help you see better, look better, and feel better compared to wearing glasses with uncoated lenses.

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[1] Secondary principal point of lens [2] Focal length [3] Angle of view (measured diagonally) [4] Focal plane (image sensor plane)

Longer focal lengths correspond to higher magnification and vice-versa. Wide-angle lenses with short focal lengths have low magnification, which means you have to get physically close to an average-size subject to fill the frame. But that also means you can fit large subjects in the frame without having to shoot from a distance. Telephoto lenses with long focal lengths have high magnification, so you can fill the frame with subjects that are further away from the camera.

The "Focal length vs. angle of view" comparison illustrates this relationship for both 35 mm full-frame and APS-C format cameras.

Lens coatings can give you a clearer vision that’s more natural compared to uncoated lenses. AG and AR coatings may be the right option for you if:

With long focal lengths, foreground and background objects will often appear to be closer together in the final image. This effect is sometimes called "telephoto compression", although it is not actually caused by the lens itself. What really happens is that when using a telephoto lens, you will need to be further away from your subjects. So, relative to the distance from the camera to the foreground and background subjects, they actually are closer together. Another way of saying this is that since both the foreground and background objects are at a considerable distance from the camera, their relative sizes in the final image will be closer to reality. When shooting with a wide-angle lens you normally need to get close to the foreground subject so that it is sufficiently large in the frame, which is why more distant objects look comparatively smaller. The difference in apparent perspective is actually a result of how far you are from your subject.

The truth is, there’s more to glasses than just handing in your eye prescription and choosing frames. A big part of picking the right pair of glasses is selecting a suitable lens material.

"Angle of view" describes how much of the scene in front of the camera will be captured by the camera's sensor. In slightly more technical terms, it is the angular extent of the scene captured on the sensor, measured diagonally. It is important to remember that angle of view is entirely determined by both the focal length of the lens and the format of the camera's sensor, so the angle of view you get from any given lens will be different on 35 mm full-frame and APS-C format cameras. Different lenses of equal focal length will always have the same angle of view when used with the same-sized sensor.

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Unfortunately, light can also cause vision problems. Too much light, whether it be from reflection or glare, can make your eyes uncomfortable and can stop you from seeing sharp images.

AG and AR coatings are made of multiple layers of metal oxides, and they are applied to the surfaces of the lens. These layers effectively reduce the amount of light reflected onto your lenses, allowing more light to be transmitted through the lens without the glare.