Single-vision lenses

Single-vision lenses

Optimum vision with
Wetzlich single-vision lenses

What are single-vision lenses?

Single-vision lenses are defined as lenses with a single effect (correction of simple ametropia and astigmatism). The following types of ametropia can be corrected with single-vision lenses:

Short-sightedness (also called myopia) is a weakness of the eye. In a short-sighted eye, the focal point (the point where the light rays meet again – i.e. where the image is formed) is in front of the retina. In a normal eye, this focal point would lie directly on the retina and thus produce sharp vision. The result is an aberration that makes nearby objects appear sharper than those further away. Hence the term short-sightedness. Short-sightedness is determined and identified by an eye examination (refraction) with an optician or ophthalmologist. It is specified in dioptres (unit of measurement for refractive power). On your spectacle prescription, you will find information about myopia under the abbreviation: sph (sphere). This value is negative for short-sighted spectacle wearers. CAUSES OF MYOPIA Axis myopia The eyeball is too long. As the image is focused in front of the retina and then dispersed, vision is blurred. Refractive myopia It is also possible that the refractive power of the lens system of the eye (cornea, lens) is too strong. This then causes the image to appear in front of the retina, as in axial myopia. Myopia
Long-sightedness (or hyperopia) is similar to myopia in that it is a weakness of the eye. In a long-sighted eye, however, the focal point lies behind the retina, so that in the relaxed state of the eye everything looks blurred. The eye can compensate for this to a certain extent by tensing the lens in the eye. Just like myopia, there are two different causes: Axis hyperopia The eyeball is too short, therefore the light meets behind the retina and creates a blurred image (the opposite to myopia) Refractive hyperopia In rare cases, the refractive power of the eye’s lens system is too weak (again in contrast to myopia). Hyperopia

Astigmatism is a deformation of the cornea. In contrast to myopia and hyperopia, the length or shortness of the eyeball is not relevant here. The curvature of the cornea is not uniform, but has a dent in it. As a result, the light cannot be refracted properly and does not meet on the retina to form a point, but rather a rod shape. “Astigmatism” is derived from the words “A” for “not” and “stigma” for “point”. The translation would then be: “not at one point”.

Quality lenses – a difference you can see

In addition to distortions towards the edges, spherical lenses have a significantly higher inherent magnification or, in the case of minus lenses, reduction in size. You can reduce these defects with modern aspheric or multi-aspheric glasses.

Our aspheric single-vision lenses: Weviral, Weviral Lifestyle
Our multi-aspheric single vision lenses: Signature, Signature Plus, Trinity, Trinity Plus

Darstellung von Refraktionsfehlern

How do you achieve optimal vision at every single point of the lens? Non-optimised lenses have restrictions for the wearer on the periphery, i.e. on the outer edge of the lens. In addition, the image deteriorates as soon as you look through a lens at an angle, because conventional lenses are not optimised for the wearer at every point.

Digital Ray-Path technology simulates how our gaze moves on the basis of the frame shape and individual parameters and adapts every point of the lens to the wearing situation.

Our single-vision lenses with Digital Ray-Path technology: Trinity, Trinity Plus.

Single-vision lenses with near vision support

As a result of the complete integration of mobile devices (smartphones, tablets) into everyday life, a perfect view of your surroundings is becoming more and more important. Since human beings are naturally designed to see better at a distance than at close range, consideration, should be given at an early stage to near vision support in the lens. Single-vision lenses with close-up support are also aimed at the target group of 30 to 45-year-olds. A majority of this target group works several hours a day at a PC and suffers from eye fatigue. In addition, they must deal with various strains that did not exist in the past, such as reading long texts on a smartphone.

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