Scheme of chromatic aberration - a) simple lens: rays of different wavelengths create three different foci, b) diplet lens: rays of different wavelengths meet at a common focus.

People working in offices or with digital screens are often exposed to more artificial light which bounces off their lenses. Anti-reflection can reduce this, supporting your eye health.

Köhler's lighting principle is the principle of setting the light apparatus in such a way as to achieve the best possible results in the contrast of the specimen. Applying Köhler's principle, the condenser projects a field diaphragm into the object plane, and the condenser diaphragm allows light to flow only into the field of view of the objective [4].

Due to the delicacy of this coating, you should only use recommended cleaning products on your anti-reflective lenses. Always wet your lenses first before cleaning them with a cloth; they can be easily scratched which is more noticeable on AR lenses.

In addition to lenses, eyepieces also have an eyepiece diaphragm. According to the position of the eyepiece diaphragm in relation to the lenses, we distinguish two basic design types of eyepieces: the positive eyepiece, in which the diaphragm is located in front of the lenses (closest to the object plane), and the negative eyepiece, where the diaphragm is usually located behind the first lens. The simplest type of positive eyepiece with two lenses is called a Ramsden piece; the simplest type of negative eyepiece is called a Huygens eyepiece.

The light microscope is mainly used for its relatively easy production and the ability to observe preparations dynamically, without damaging them (unlike microscopes using other types of electromagnetic radiation) and with preservation of color (unlike electron microscopes).

Diagram of light flow through a light microscope: 1) light source, 2) collector lens, 3) mirror, 4) field diaphragm, 5) condenser and condenser diaphragm, 6) stage with specimen, 7) objective

In total, we distinguish three basic construction types of lenses: achromatic lens, fluorite lens and the most complex apochromatic lens. Achromatic and fluorite lenses have a smaller number of lenses at the same magnification value and thus a significantly worse correction of optical defects [5].

Although they sound very similar, the main difference is anti-glare protects from external light sources; diffusing light which bounces off surfaces (such as roads, water or snow) and causes that blinding glare. Whereas anti-reflective lenses go one step further by diffusing both internal and external light sources and removing reflections within your lenses.

Excess light naturally causes our eyes to squint in order to protect our eyes and focus on what’s in front of us. Less squinting will reduce eye strain, tiredness and headaches too.

Have you ever found yourself squinting because light (real or artificial) is reflecting into your line of sight? Anti-reflective lenses eliminate these frustrating reflections. Also known as anti-glare or AR, this particular coating removes scattered light which reflects on the front and back of your glasses lenses. Permitting up to 99% of light into your eye ultimately enhances your vision, creates sharper visuals and allows others to see you more clearly too.

These parts are supplemented by a mechanical system into one functional unit. In developmentally older microscopes, it was common to use only one biconvex connecting lens and a kahan or candle light [1].

Optical coating

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Similar to lenses, a larger number of lenses will provide better correction of optical defects; so-called plan eyepieces provide the best correction of optical defects.

Optical coating process

Schematic of the appearance of almost completely open (a) and half-closed (b) field diaphragms when viewed through the eyepiece.

When choosing an eyepiece, it is essential to choose an eyepiece that best matches the given lens - the main factors are the brightness , focal length and numerical aperture of the lens.

A light microscope is a complex optical device that, with the help of several optical systems, enlarges the eye of vision and thereby improving its Resolution up to a thousand times.

anti-reflective coating是什么

The Eyepieces are the last part of the microscope through which the light rays from the light source pass. They participate in the final adjustments of the image. Similar to lenses, they consist of several lenses that work together as a connecting lens; but the number of lenses in the eyepiece is significantly smaller. The eyepiece lenses collectively produce an apparent, magnified, non-inverted image; the overall image produced by the microscope is therefore apparent, magnified and inverted.

Scheme of coma/astigmatism - light rays do not point parallel to the optical axis, thus creating an asymmetric image (yellow ellipse) in the projection plane (blue circle).

With more light transmitting into your eyes (99% in fact), you can fully see what’s ahead of you—providing sharper images, crisper contrasts, and more confidence in your sight.

Anti-reflective coating is made up of a thin chemical layer which is applied to both the front and back of your lenses. It is a very effective coating which eliminates the unnecessary light which causes glare and reflective distractions. Instead, it emits more light into your eye, helping improve vision. On average, anti-reflective lenses can last up to 2 years, if correctly cared for.

An anti-reflective coating can be applied to both prescription and non-prescription lenses, so no matter your lifestyle, everyone can benefit from anti-reflective glasses! With laptops, phones and digital devices becoming more constant in our day-to-day lives, anti-reflective coatings help protect your eyes from excess LED or artificial light, these are more commonly known as blue light glasses. If you drive a lot, especially at night, anti-reflective can also reduce the distraction of blinding reflections, allowing you to have a clear sight of the road or potential hazards ahead.

As we said, anti-reflective glasses can be worn by anyone and applied to any style of glasses, including sunglasses. Meaning they can be worn all year round, within any setting.

After being directed by the lighting apparatus, the light first passes through the observed specimen and then through the objective and eyepiece. Angled mirrors can be placed between the individual components of the lighting apparatus, which direct the light rays in the desired direction, but do not adjust the shape of the light cylinder/cone.

Surface coating

Ar coating

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The objective is the most important part of the microscope - the quality of the objective determines the resulting magnification of the microscope and the resulting image quality. It is also the most difficult to construct. It usually contains a large number of lenses of different shapes and in different groups (in triplets, doublets or individually) fixed in the lens barrel. The layout, number and shape of the lenses is individual for each type of lens and significantly affects all lens parameters. The entire lens system of the objective functions together as a connecting lens.

Anti-reflective lenses become invisible to the camera, so you can enjoy no more reflections in your lenses from flashes or selfies, creating better-quality photos.

Absolutely. Using our reglazing service, you can choose whether to have your existing frames reglazed or have your prescription lenses put into any frame you like via our free-post service. Order a pack from us and select the coatings and prescription you need, and Lensology will reglaze your lenses to order. Our anti-reflective coating is available on all lens types, including single vision, sunglasses lenses, bifocal lenses, varifocal lenses, and more. For more information, read our FAQs or get in touch today.

By eliminating the reflection of streetlights, headlights or even your dashboard, you are increasing your vision clarity, helping you stay more alert and reactive on the road.

In the preparation of specimens, dyes are often used , which cover the true color of the sample; however, different shades and depths of color are still preserved in places with different chemical and physical properties.

anti-glare什么意思

antireflective coating中文

Diagram of the appearance of the cone of light when the condenser diaphragm is open (a) and closed (b) - the condenser is located at the bottom, the light is directed into the lens.

In practice, the mechanical system is the system with which the user comes into contact the most. A properly designed mechanical system is a necessary condition for a high-quality microscope: it ensures firm anchoring of the lenses and apertures, the correct angle of the light rays and the object plane, and a very fine mutual displacement of the optical systems and the object plane ("focusing").

The lighting apparatus is used to illuminate the object plane as perfectly as possible (that is, the plane of the table on which the specimen is located). The main function is to ensure the correct direction and intensity of the light rays to adequately illuminate the preparation (without unwanted reflections, so that the features and structures of the preparation are as clear as possible). This function is best fulfilled when applying the so-called Köhler lighting principle, which will be described below.

These parameters fundamentally depend on the construction of the lens. In practice, the values ​​for a specific lens are usually written on the side of the body (mount) of the lens itself.