Frequently Asked Questions

TITANflex Frames

How is TITANflex® produced?

The manufacturing process of TITANflex®.

This special titanium alloy is general melted under high vacuum in an electric field. This process is called vacuum induction melting.

By means of conventional hot and cold forging, the cast bar is preferentially turned into wire, but also into sheets and tubes. To obtain the maximum superelastic elongation in the temperature range required by us, the material is subjected to a strictly controlled thermo-mechanical treatment.

What are the advantages of TITANflex®?

TITANflex® is really quite a normal spectacle frame. If there wasn't the little something: the material from which the frame is made!

A super flexible titanium alloy - the material of the future.

TITANflex® is 10 times more flexible than conventional spring steel! This super flexibility is caused by an effect which scientists call phase transition. Such transitions are temperature dependent.

We have treated the material in such a way that the optimum elasticity occurs at temperatures between -15°C and +40°C. Within this range, the frame returns to its original shape even after extreme deformation - not just once, but again and again. Therefore, it always fits to perfection.

Where can TITANflex be used?

As the super flexible wires have good biological compatibility, they were first used for medical technology. They were first used in the USA for orthodontic braces. Due to the almost constant tension across a wide elongation range, they are ideally suited for gentle treatment.

Super elastic titanium alloys are also suitable for instruments and equipment for many diagnostic and therapeutic interventions. Buckling resistance, controllability and extreme flexibility make super elastic titanium alloys unique for these applications.

Eschenbach have developed revolutionary spectacle frames from this material.


What is an aspherical surface?

Aspherical surfaces are surfaces which refract or reflect and which deviate from a spherical form.

In our case, this is a surface which arises by rotation of a tangential focal line around an axis, for example a paraboloid, ellipsoid, hyperboloid.

What is an optical aberration?

With lenses, geometric-optical aberrations occur, such as chromatic aberration, spherical aberration, astigmatism, coma, field curvature and distortion which can be largely corrected by application of sufficient effort.

What are the special features of our illuminated LED magnifiers?

All LED magnifiers provide a very even illumination of the field of view.

The required voltage of 3.6 Volt is provided by two batteries (AA or A) via a step-up converter. If required, the white/blue light can be coloured via a filter cap (lower blue component). In practice, most users (with AMD) prefer the white/blue light.

What are the special benefits of our cera-tec hard coating?

The Cera-Tec hard coating of our aspherical lenses and many special vision aids provides a surface which is (almost) as hard as glass, but at the same time flexible (without surcharge).

Cera-tec guarantees many years of brilliant vision.

This hard coating has been optimised by the Fraunhofer Institute in Würzburg, Germany

How does good contrast affect the visual acuity?

High contrast and brightness can have a positive effect on visual acuity.

Measures to improve contrast in case of weak contrast are: lens coatings, edge filters, possibly peaked caps, spectacles with side protection and tinting of the support lenses of the frames for telescope systems. The inverse setting of electronic magnifiers means that considerably less of the white, contrast-reducing light (from the white text background) can penetrate the eye.

What effect does light have on vision? What do light and vision mean with age?

The presence of a lot of light (mainly white daylight) can considerably reduce the magnification required.

Sometimes, good lighting alone can make reading possible again. In case of clouding of the eye (lens, vitreous body, etc.) diffuse glare can occur with additional lighting. In this case, light must be used carefully. With age, considerably more light is required for high-contrast vision Magnification should always be tested with light (if possible).

Is the type of eye disease important when testing vision aids? If not, why?

No! The still intact and usable areas of the retina are important.

If the retina is still sufficiently large (at least 5 degrees), then reading becomes possible again with sufficient magnification. It is of no relevance to the fitter of magnifying vision aids which disease is damaging the retina.

What effect does astigmatism have on far and near vision?

Astigmatism should always be taken into account for distance refraction.

A small astigmatism can be ignored for the reading distance depending on visual acuity and magnification required.

Rule of thumb for the reading distance: astigmatism can be ignored for up to half of the magnification requirement. For a magnification of 4x required for newsprint (corrected vision of 0.12), allowing for astigmatism of 2 dpt does not, as a rule, result in improved vision. Whether the astigmatism is taken into account nonetheless (feeling of improvement) has to be decided by the vision impaired customer.

What is long-sightedness, short-sightedness, presbyopia, weak sight and how can these be optically corrected?

Long-sightedness or hyperopia.

The eye is too short. The focal point of the eye is beyond the retina. For a short time, long-sightedness can be compensated or reduced by the eye's own accommodation. However, this constant accommodation effort can lead to strain. Possible consequences: e.g. tiredness, headache. Hyperopia must therefore be compensated by plus lenses (convergent optics).

Short-sightedness or myopia.

The eye is too long. The focal point of the eye is in front of the retina. Myopia cannot be compensated by the eye's own accommodation. An uncorrected eye simply does not see clearly. Myopia must therefore be compensated by minus lenses (divergent optics).


The decreasing capability (accommodation power) of the eye to see clearly at close range which is caused by the decrease in elasticity of the lens. This process starts already in childhood. After the age of 40 it is no longer possible to read at the normal reading distance. A person with presbyopia now requires reading glasses. The strength of the reading glasses (addition) depends on the remaining accommodation power. After the age of 60, the remaining accommodation (about +0.5 dpt) can be disregarded. If, for example, a person of age 65 wants to read at a distance of 33 cm, we have to offer reading glasses of +3 dpt (in addition to distance correction).

Lazy eye or amblyopia.

This condition describes insufficient vision of an eye which cannot be corrected by an appropriate lens. Weak sight can also be congenital. This also covers strabismic amblyopia (squint). When squinting, a different image is formed in each eye. In order for the brain to be able to see clearly nonetheless, one eye is "switched off" in the vision centre. This unused, untrained eye become amblyopic.

What is a dioptre?

A dioptre (dpt) is the inverse of the focal length of an optical system measured in metres.

An optical lens with a power of + 1 dpt has a focal length of 1 m. An optical lens with a power of +10 dpt has a focal length of 0.1m.

What is the best way to clean my magnifier/magnifying glass?

You can use a soft cotton or linen cloth for cleaning.

Please only wipe lightly over the lens. You can also wet the cloth with lukewarm water for heavier soiling. Never use alcohol-based solvents or organic solvents to clean the lens as these could destroy the lens.


What do figures such as "8 x 32" or "10 x 42" mean?

The value "8 x" or "10 x", for example, refers to the apparent magnification of an object. 8-times magnification means, for example, that an object at a distance of 800 m appears as if it was only 100m away.

The value "32", "42" or "56", for example, following the magnification value refers to the lens diameter of the binoculars in mm. This is an important performance criterion for binoculars. The bigger the lens diameter is, the more light it gathers and the brighter the image.

What is the field of view? And what does "Ww" mean?

The field of view specifies the diameter of the image section at a distance of 1000 m. The value could be 130 m / 1000 m. The field of view is printed onto all Eschenbach binoculars.

The greater the field of view, the easier it is to view landscapes or moving objects, for example at sports events or when observing animals. Binoculars marked Ww have a particularly large field of view. Ww = wide angle.

What is the difference between Porro and roof prisms?

Binoculars with Porro prisms have the "classical" wide shape. Owing to the fact that the lenses are further apart, conventional Porro prism binoculars offer a slightly more 3D image at short distances.

Binoculars with roof prisms, on the other hand, are very compact and have a particular slim build. A higher level of precision engineering is required for roof prism binoculars than for Porro prism binoculars of the same quality level.


Why is daylight™ so good for you!

Daylight™ technology

With full spectrum daylight™ technology, your eyes will still be fresh at the end of the day! No headaches, no red-eyes, working under daylight™ is as relaxing and natural as a walk in the park.

Daylight™ colours

Love colours just the way they are! Our daylight™ technology not only reduces eye-strain; it also gives you the best colour matching ever.

Energy saving

All daylight™ bulbs and tubes use 80% less energy and last 10X longer. When you work with your lamp, you reduce your electricity bill and do your bit for the planet.

Low heat

Even if you touch the shade or tube of this lamp by accident, you will be safe. All our bulbs and tubes use the daylight™ low heat technology for ultimate comfort and safety.

What is the difference between energy saving and tungsten bulbs?

Light comparison between energy saving and incandescent bulbs Energy saving bulbs save up to 10 times longer Energy saving bulbs use up to 80% less energy

What is the Light Colour Temperature (°K)?

    • This is the colour of the light as perceived by the human eye. It is measured in degrees Kelvin (°K)
    • The colour temperature is derived from heating a block of carbon to the specified temperature and observing the colour it glows.

For example:

Temperature of around 2,500°K gives a Red / Orange colour. This is like Sunrise and sunset has a very warm feeling.

Temperature of around 10,000°K gives a Blue colour. This is like a Blue Sky has a very cool feeling.

  • In between the above extremes is the White Light we want to achieve (at around 6,000 to 6,500K). This is the colour temperature rating of our daylight Compact Fluorescent Bulbs & Tubes.
  • The general terms used for artificial light colours are:
    • Warm White (3,000K)
    • Cool White (4,100K)
    • daylight (6,500K) ← This is what our bulbs & tubes are