Lens manufacturers want to make it easy for their customers to select a coating, which is why they offer packages for different coatings. And ZEISS is no exception: with the  DuraVision®  Premium lens coatings, you receive a complete package comprising top anti-reflective, hard, antistatic and CleanCoat coatings.

A premium lens coating can help, one that’s integrated into the  ZEISS DriveSafe lenses. This reduces the subjective sensation of glare1 – e.g. from oncoming vehicles with LED or Xenon headlights – and effectively protects your lenses from both scratches and the adhesion of dirt particles.

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The residual reflection is usually green. The modern Duravion®  Premium lens Coating  from ZEISS has an attractive, bluish residual reflection. The barely perceptible bluish residual reflection increases the amount of light the lens transmits to your eyes. And not only that – the blue is less visible to the eye. This means lenses with this residual reflection have the advantage of making your eyes look clearer to other people and have fewer reflections. Your eyes look more natural, almost as if you’re not wearing glasses at all.

We’ve all been there: Unpleasant glare from oncoming traffic or street lights impairing our vision. This is tiring for drivers and can even become dangerous.

Anti-reflective lenses can be recognized by the residual reflection. Regardless of the material used for the lenses, they have a characteristic color when you hold the glasses at a slight angle against a white background. This is highly practical for the wearer: the optician can identify the anti-reflective coating and even offer the same high quality if a switch to another material is desired.

Lenses without anti-reflective coating have a big disadvantage:  They reflect a lot of light, which can distract the wearer. These reflections are particularly annoying on wet roads or when driving at night, but also when the person you’re talking to can see themselves in your glasses.

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For plastic lenses you definitely need a hard lacquer coating. While plastic lenses are easy to wear, the material used is softer and more prone to scratches than glass lenses (a.k.a. mineral lenses) – at least if untreated.

Our vision has changed enormously now that we use digital devices such as smartphones, tablets, and modern illumination through LEDs and displays. We are subjected to more blue light than ever – all day long, in fact. High-energy blue light is also believed to have a negative impact on vision over the long term.

One thing’s for sure: Light has a considerable effect on managing our internal body clock, and thus our sleep patterns. Strong light in the early evening tells your body to stay awake for longer. When you look at the screen on your computer or another digital device, you subject your eyes to large quantities of blue light, causing such things as reduced contrast sensitivity. Focusing on a screen can also be strenuous for you and your eyes, and contribute to digital eye strain.

If a beam of linearly polarized monochromatic light enters a birefringent crystal along a direction not parallel to the optical axis of the crystal, the beam will may be divided into two separate beams.  Each will be polarized at right angles to the other, and they will travel in different directions.  The intensity of the original beam will be divided between the two new beams in a manner which depends on the original orientation of the electric field vector with respect to the crystal.  The ratio or the intensities of the two orthogonally polarized beams can have any value.

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In other devices the changes in direction of propagation between the two rays is used to separate the incoming beam into two orthogonally polarized beams as in the Wollaston and Thompson beam-splitting prisms.

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The extraordinary ray violates both Snell’s Law and the Law of Reflection.  It is not necessarily confined to the plane of incidence.  Its speed changes with direction.  The index of refraction for the extraordinary ray is a continuous function of direction.  The index of refraction for the ordinary ray is independent of direction.  When the ordinary index of refraction is plotted against wavelength, the dispersion curve for the ordinary ray is a single unique curve.  The dispersion curve for the extraordinary ray is a family of curves with different curves for different directions.  A ray normally incident on a birefringent crystalline surface will be divided into two rays at the boundary, unless it is in a special polarization state or unless the crystalline surface is perpendicular to an optic axis.  The extraordinary ray will deviate from the incident direction while the ordinary ray will not.  The ordinary ray index n0 and the most extreme extraordinary ray index ne are together known as the principal indices of refraction of the material.  The direction of the lesser index is called the fast axis because light polarized in that direction has the higher speed.

A half-wave plate δ = π can be used to rotate the plane of linearly polarized light.  The angle of rotation is 2θ, where θ is the angle between the angle of polarization and the wave plate's fast axis.

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So why not talk to your eye doctor about the anti-reflective coating options today! Ask for their tips about what you need to look for to ensure your coating lasts as long as it ought to.

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The two beams within the birefringent crystal are referred to as the ordinary and extraordinary ray, respectively.  The polarization of the extraordinary ray lies in the plane containing the direction of propagation and the optic axis, and the polarization of the ordinary ray is perpendicular to this plane.

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In the Glan-Taylor polarizing prism shown on the right the rejected (ordinary) ray is absorbed by black mounting material in the prism housing.

Unfortunately, no coating will mean never having to clean lenses again. However, lenses can be coated in such a way that impurities are less likely to adhere to the lens. CleanCoat makes the lens surface smooth, making it more difficult for dirt and dust to adhere. This simplifies lens care tremendously. The smoother the lens surface, the better.

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Formerly only needed when the sun was shining brightly, sunglasses with a  mirror coating are now very much in vogue – and they’re available in your prescription! Talk to your optician today to see the wide range of colors and functions available for sunglass coatings.

Just like a lotus leaf, water beads right off thanks to the wetting properties of the coating. A great bonus, particularly for anti-reflective lenses, because you’re more likely to notice dirt through improved reflection reduction than on lenses without such a coating.

The figure below shows the trace of the field vector Ex = E0exp(i(kz - ωt)), Ey = E0exp(i(kz - ωt + φ)) in a plane perpendicular to the z-axis when looking towards the source.  (E0x = E0y = E0)

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Another coating level with antistatic function can also help keep your glasses cleaner: fluff – from clothes, for example – adheres to these lenses much less.

It helps you see more clearly, without distortions, makes your glasses more attractive and allows you to see clearly and without reflections.

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Lens coatings provide extra protection for your lenses and transform modern plastic lenses into strong visual aids. Sadly, we often don’t give due consideration to the importance of lens coatings when purchasing a pair of glasses. The decision about coatings is usually left to the optician. In order to help you choose between anti-reflective, hard, CleanCoat and other coatings, we’ve put together a guide that explains the different options. After all, the choice is yours!

With DuraVision DriveSafe, 64% of wearers tested said they experienced fewer problems with glare thanks to the new coating compared to other premium anti-reflective coatings. Source: Internal wearer trial (CZV employees in Germany), external wearer trial (eye care professionals and consumers in Spain)

When the sun is at a low angle in the sky, the sunlight reflecting off the surface of water is nearly 100% horizontally polarized because the angle of incidence is close to the Brewster angle.  Glare-reducing sunglasses are coated with a polarizer with a vertical transmission axis and therefore block the reflected light.

Lenses can help protect your eyes against blue light thanks to a special filter, making it easier to work at a computer or use digital devices. Thanks to DuraVision® BlueProtect from ZEISS, you receive a premium lens coating together with a blue light filter, which is great for all wearers who are often indoors and find that the light emitted by LED light bulbs, TVs or computer monitors makes them tired or uncomfortable. It is therefore advisable to opt for this lens coating, even for glasses you need for work or when watching TV.

Infrared (IR) Fresnel Lenses used as collecting optics for infrared detectors with minimal absorption loss in the infrared are available at Edmund Optics.

Self-tinting lenses are a great idea for anyone who doesn’t want to change their glasses in the sun as these lenses incorporate a special technology which adapts to the sun – e.g.

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A quarter-wave plate δ = π/2 can be used to convert linearly polarized light to circularly polarized light.  The incident linearly polarized light must be oriented at 45o to the wave plate's axes.  A half-wave plate δ = π can be used to rotate the plane of linearly polarized light.  The angle of rotation is 2θ, where θ is the angle between the angle of polarization and the wave plate's fast axis.

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Just ask your optician. Choosing the right coating also matters if you’re buying children’s glasses or a second pair for yourself – so don’t leave this important decision to chance!

Special coatings with a hard lacquer matched to the material not only enhance the scratch resistance of the lenses, they also ensure constant visual quality and extend durability. Thanks to the DuraVision® Platinum coating, ZEISS offers a solution that is three times harder than the previous generation of hard (AR) coated plastic ZEISS lenses and 35% harder than AR coated mineral (glass) ZEISS lenses. This is made possible by the way ions seal the lens when the coating is applied.

Jan 18, 2023 — The binocular microscope possesses two main parts - optical and non-optical. Learn binocular microscope anatomy with labeled diagram.

How can you recognize the ZEISS DriveSafe coating? The ZEISS DriveSafe coating is evident from a slightly violet residual reflection on the lens, which is barely visible and therefore not distracting.

Linearly polarized light is a special case of elliptically polarized light.  If the light is linearly polarized, then the two components oscillate in phase,  for example Ex = E0xexp(i(kz - ωt)), Ey = E0yexp(i(kz - ωt)), φ = 0.  The direction of E and the direction of propagation define a plane.  The electric vector traces out a straight line.  For example, E = Ei = E0xexp(i(kz - ωt))i.

It’s all about protecting your eyes from the sun and glare when you’re outdoors. You and your eye doctor can create your ideal sunglasses in terms of both color and style. Colored coatings for sunglasses are available for plastic and mineral lenses. A wide selection of lens tints – from single colors and gradient tints to dual color or even special tints for medical purposes – feature in the range of sunglasses from ZEISS. So your glasses, whether single vision or progressive lenses, will become your favorite accessory that also delivers first-class protection against the sun.

The electric field vector E can always be resolved into two perpendicular components.  The light is elliptically polarized, then the two components have a constant phase difference, and the tip of the electric field vector traces out an ellipse in the plane perpendicular to the direction of propagation.