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The refractive index of an optical window determines how light bends as it passes through the material and is an important factor in the design of optics such as lenses or prisms. The refractive index of an optical window depends on the material of the window and the wavelength of the light.

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.

For plastic lenses (organic 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.

So why not talk to your optician about the anti-reflective coating services on offer and about the coatings’ durability today! Ask for their tips about what you need to look out for to ensure your coating lasts as long as it ought to.

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.

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 colours and functions available for sunglass coatings.

The choice of optical window material depends on its application. Optical glass is commonly used for visible light applications while crystals (sapphire, CaF2, ZnSe, ZnS, Germanium, etc.) are preferred for UV or IR applications referred for UV or IR applications. These two materials are the most commonly used. To determine the most suitable material for the requirements of the expected application, it is necessary to consider its properties, and more specifically: its transmission, refractive index and hardness.

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To respond effectively to the expected use and the targeted spectral range, the selection of the material is crucial. It will be chosen from three main categories: Categories: Glass, Polymer or Crystal. Let’s take a look at the main characteristics of these families of materials.

Lenses without an anti-reflective coating have a great disadvantage: There is a lot of visible reflection for the wearer. These reflections are particularly distracting on wet roads or when driving at night, but also when talking to someone as that person will see themselves reflected in your glasses rather than look at you.

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.

To design an optical window, it is crucial to define precise specifications in advance that indicate the objectives of use and the conditions of application. This helps in selecting the most suitable material based on known performance criteria such as transmission, refractive index, and hardness.

The Knoop hardness is used to measure the hardness of the material. This parameter is very important for optical window applications in harsh environments (pressure, high temperature, etc.) or abrasive conditions. The higher the Knoop hardness of a material, the higher its mechanical strength or scratch resistance will be.

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!

Optical windows are used for a wide range of industrial and research applications such as visual inspection of equipment, monitoring of manufacturing processes, conducting medical or mechanical experiments, and performing spectroscopy studies. When designing an optical window, it is important to consider the application environment and the spectral domain to achieve the desired results. These two criteria are essential for determining the choice of manufacturing material. In this article, we will introduce you to the three main families of materials and the main criteria for selecting components for an optical window that guarantees optimal results.

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.

The optical window can have different shapes (round, rectangular, oval or freeform) depending on its use and the application medium. Industry (aeronautics, defence, security, transport, petrochemicals, etc.), research institutes, private or public laboratories use optical windows to conduct tests, carry out measurements, inspections or to carry out work in the field of spectroscopy (UV) and thermography (IR).

Anti-reflective lenses can be recognized by the residual reflection. Regardless of the material used for the lenses, they have a characteristic colour 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.

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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. Read on to find out more.

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Lens coatings act as a protective coating for your lenses, transforming modern plastic lenses into strong everyday objects. Unfortunately, lens coatings are often not given the importance they deserve when people purchase a pair of glasses, with wearers pretty much leaving this decision up to the optician. To make sure you’re well-prepared when it comes to anti-reflective, hard, CleanCoat and other coatings, we’ve put together a guide to help you find your way around the maze of coatings. After all, the choice is yours!

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

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Transmission is the ability of the material to transmit light in a given wavelength. The reflective and absorption capacity of light defines the percentage of transmission. For applications in the field of imaging or spectroscopy, high transmission is paramount to obtain quality images or data.

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)

It enables transparent, clear and unimpaired vision, makes glasses more attractive and permits uninterrupted and reflection-free vision for the wearer.

An optical window is an observation interface that separates two environments while allowing the chosen light to pass through. Made of a material that can be transparent, the optical window is designed to maximize transmission in a certain spectrum (ultraviolet, visible, infrared) while minimizing light reflection and absorption. This is the result of the choice of material-specific mechanical and optical characteristics.

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.

Wintech Groupe is a French company which specialises in the study, design and manufacturing of optical, optomechanical and optotronic precision components and solutions. For more than 20 years, Wintech Groupe has placed innovation at the heart of its activities via ultra-modern production equipment, the choice of high quality materials and a team of experienced engineers ›› Learn More

Basic optics set can be used by itself or with the current optics experiments. Two acrylic lenses (one double convex and one double concave). Three mirrors.

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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It can be dedicated to the protection of equipment by limiting the impact on incoming and/or outgoing optical signals. The optical window can also be used as a viewing and/or measuring lens while preventing external elements such as water, dust or air from coming into contact with the inside of the equipment.

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.

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.

When selecting a material for manufacturing an optical window that is suitable for a given application, several criteria are considered, including transmission, refractive index, and Knoop hardness

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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. PhotoFusion X by ZEISS

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The weekly airborne images are hyperspectral, meaning they contain many more spectral bands of discrete wavelengths than a typical spaceborne satellite image.

The wave plate produces its own optical path difference. When the light passes first through the specimen and then the accessory plate, the OPDs of the wave ...

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It’s all about protecting your eyes from the sun and glare when you’re outdoors. You and your optician can create your ideal sunglasses in terms of both colour and style. Coloured coatings for sunglasses are available for plastic and mineral lenses. A wide selection of lens tints – from single colours and gradient tints to bi-colour 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 favourite accessory that also delivers first-class protection against the sun.

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.

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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.