Polarized sunglasses are great for many situations. They can even be an ideal choice for everyday use. But if you enjoy a busy outdoor lifestyle, polarization matters. Here are some activities in which many people find polarized lenses to be most helpful:

If you need prescription polarized sunglasses, Costa has you covered. Costa 580s are available in prescription single-vision and multifocal lenses.

For those who live their lives on the water, there’s nothing quite like the thrill of being out on the open waves, casting a line or waiting for that elusive catch. Whether you’re a water enthusiast or an angler at heart, the key to a successful day on the water isn’t just your gear and skills — it’s also what you can see beneath the surface. That’s where polarized glasses come into play.

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Unpolarized light disperses in all directions as it reflects off uneven surfaces. When light is polarized, however (like through polarized lenses), it reflects within a single plane. For instance, sunlight bouncing off water can create a glare that makes it difficult to see clearly, especially when looking into the water.

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However, these are only simple approximate equations, just like any other equations published on this topic. Image sharpness and depth of field are strongly influenced by the optic design and the optical errors. An unsharpness of the image points is additionally caused by chromatic and spherical aberration, coma and astigmatism and can make up one entire pixel already in case of very small camera pixels.

Polarized lenses can also be helpful when driving, though caution is advised. They are wonderful for daytime driving because they can reduce glare from light reflected off roads, cars, buildings and other surfaces.

Polarized (or anti-glare) lenses function as optical filters. They contain a unique chemical that filters the horizontally polarized light that causes the harsh glare often encountered on water and other surfaces. By only allowing vertical light waves through to your eyes, this chemical filter helps decrease glare, improve contrast and boost visual clarity.

From seasoned anglers to weekend water enthusiasts, Costa’s polarized sunglasses offer something for everyone. Explore the world with Costas for a better look at what’s out there.

Wearing polarized sunglasses when you’re on the water can make all the difference in your day. Polarized glasses can help enhance performance in nearly every water activity, including:

In our example, the optics was focused in such a way that the object y1 is depicted as a sharp image y´1 on the sensor. An object which is closer to the optics generates a point of focus behind the sensor (by re-focusing to this working distance, the lens group would actually move away from the sensor in order to create a sharp image again). Therefore the image on the sensor (image plane) is blurred, the ideal sharp pixel blurs to a larger light spot called blurred spot. The resulting unsharpness is only perceived when the diameter of the blurred spot is larger than the camera pixel and its image information is depicted on neighbouring pixels.

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Costa 580 lenses provide 100% UV protection in addition to filtering blue-violet light. They are available in two materials:

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Wearing polarized glasses is often key to enhancing your visual comfort in bright outdoor conditions. Even on a cloudy day, glare can cause eye fatigue and hinder your ability to read the water with precision.

The exact calculation of the expansion of the depth of field requires several individual calculations. The formulae used here are based on the publication by Greenleaf, Allen R., Photographic Optics, The MacMillan Company, New York, 1950, p. 25-27.

A prerequisite for robust inspection is a sharp image in most of the cases. In Z-direction (towards the camera and away from it) only a small area within certain limits is sharp: The depth of field is the scene space in depth, away from camera and optics, which appears sufficiently sharp in the video image generated by the camera. A sharp image impression is given up to an image unsharpness of approximately one pixel, in measuring applications, however, it should be kept as low as possible. For inspection applications it is important that all features to be inspected are located within this depth of field area.

Surfing and PaddleboardingAvoid distractions from glare and eye fatigue when surfing your favorite break or paddleboarding at your preferred spot. Polarized glasses help reduce the sun’s blinding glare to help you achieve peak performance.

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Polarized sunglasses offer a range of benefits, whether you’re fishing the flats in the Florida Keys or checking out the surf at your favorite break. For example, polarized lenses can:

When shopping for new polarized sunglasses, be sure to choose a pair that is labeled as providing 100% UVA and UVB protection.

It is an important concept in microscopy as it determines the extent of the specimen that can be observed at one time. The field of view is inversely ...

Water Skiing and WakeboardingGet the most from your water skiing or wakeboarding adventure with polarized lenses. Through anti-glare technology, polarized glasses enhance your ability to see potential obstacles and changes in water conditions.

In case of a completely pre-set camera system with fixed mechanic dimensions and already selected components, only the lens aperture has an influence on the field of depth: if the user closes the aperture of the lens, the field of depth in the image is increased. A higher focal ratio, however, results in a longer exposure time. The international aperture scale is arranged in such a way that each step means halving or doubling the exposure time.

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Polarized glasses offer benefits for other outdoor adventures. From golfing to hiking, anti-glare lenses can help you enjoy the world around you with greater precision and enhanced color contrast.

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Aspheric lenses minimize spherical aberrations and offer a smaller footprint resulting in lighter, more compact optical systems.

Read on to learn what polarized sunglasses are, why they matter on the water and how they can help you gain a glare-free view of the underwater world.

The best way to take advantage of polarized glasses is to make them a standard component of your outdoor gear. Whether you’re deep-sea fishing or kayaking your way to a new destination, we share your passion for the water, and our polarized sunglasses are designed to fit and enhance your lifestyle. We want you to be able to do what you love with both clarity and comfort.

Kayaking and CanoeingSitting at water level can make it more challenging to see into the water, especially when the sun hits the water’s surface just right. With polarized lenses, you have better visibility to see what’s around and beneath you, whether you’re whitewater rafting or gliding peacefully down your local river.

Polarized sunglasses come in a range of options, from lens color to frame shape. Here are factors to consider when choosing your next pair:

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It refers to the object distance at which objects lying in the infinite can only just be depicted with an acceptable unsharpness if precisely this object distance is focused. Then the field of depth stretches from half the hyperfocal distance to the infinite. First the hyperfocal distance must be calculated:

By stopping down the optics, the optical path is artificially vignetted and the blurred spot on the image sensor becomes smaller. The objects y1 and y2 can now be much further away from each other in order to create the same blurred spot as in figure a).By stopping down the optics, the optical path is artificially vignetted and the blurred spot on the image sensor becomes smaller. The objects y1 and y2 can now be much further away from each other in order to create the same blurred spot as in figure a).

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Unless sunglasses are specifically labeled as “UV-blocking” or “UV-protective,” do not assume they will help protect your eyes from the sun’s harmful rays.

Glare from the water’s surface can decrease visibility when you’re looking into the water. This can lead to eye strain as well as missed opportunities. Polarized glasses have a special filter in the lenses that reduce glare from water and other reflective surfaces.

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Fishing and BoatingFind fish, currents and underwater structures with greater clarity when wearing sunglasses with polarized lenses. By cutting down on glare, these shades give you a direct view beneath the water’s surface.

A camera sensor is a solid-state device that absorbs particles of light (photons) through millions of light-sensitive pixels and converts them into electrical ...

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Lens color – Polarized lenses are made in varying colors to enhance your experience in different lighting conditions. They typically come in blue, gray, green or brown, with or without a mirrored effect.Glass vs. plastic lenses – Polarized lenses are typically made from glass and/or plastic materials, each of which offers its own set of benefits.Frame design – Polarized sunglasses come in a wide variety of frame shapes and styles, from a standard fit to wraparound coverage.

Some snow-based activities can be enhanced with the use of polarized glasses, though it’s important know your terrain and what type of eyewear is recommended for what you’re doing.

Costa 580 lenses feature proprietary in-house technology, offering a polarization efficiency of 99.9% and nearly 100% glare reduction. These lenses enhance colors by filtering out harsh yellow light at 580 nanometers. This elevates red, green and blue light for enhanced contrast, vibrancy and clarity.

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The exact calculation of the expansion of the depth of field is somewhat more complex. Therefore you can find a complete calculation tool for the depth of field in the "Service" area. The formula used with explanations can be found at the end of this page.

All Costa sunglass lenses feature 580 technology, which offers polarization and 100% UV protection, among other benefits.

Before diving into how polarized glasses work, it’s important to understand the science behind polarization and how sunlight and glare influence this visual effect.

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There are several differences between polarized and non-polarized lenses. But the primary factors are how they affect your visual clarity and the impact of glare on your sight.

However, polarized lenses can make it more difficult to see patches of ice on the roads. You should also avoid wearing sunglasses when driving at night — polarized or not — because they can make it harder for you to see and react in a timely manner.

While polarized glasses bring many advantages to your outdoor adventures, not all offer UV protection. It’s important to note that the “polarized” label on a pair of sunglasses does not necessarily mean the pair also includes ultraviolet (UV) protection.