My variable-focus lens is packed with the latest technology.

Owing to its integral optimised design, be 4ty+® makes it possible for me to comfortably see short and long distances as well as to naturally perceive space.

My lenses are aesthetic, flat and thin.

be 4ty+® offers me optimum satisfaction in any life situation!

be 4ty+^® is a variable-focus lens that sets the tone

For daily well-being

Variable-focus lenses are becoming ever more important for the longsighted spectacle wearer. They make natural vision possible over all distances, just as was possible during one’s youth, so increasing personal well-being.

Apart from seeing naturally, the longsighted spectacle wearer expects quality, thin and light lenses, with enhanced aesthetic appeal.

A high-performance variable-focus lens has now been developed in the form of the be 4ty+® which, with its integral, technically optimised and intelligent design, fully meets individual customer requirements.

be 4ty+® was designed for dynamic and active longsighted spectacle wearers of any age. A variable-focus lens, ideally suited for first-time wearers and those switching from other variable-focus lens systems.

be 4ty+® offers:

• - the latest technology

• - natural vision owing to a broad viewing angle

• - optimum visual comfort when rapidly changing viewing angle

• - no swaying effects

• - best spontaneous tolerance

 For daily well-being

Variable-focus lenses are becoming ever more important for the longsighted spectacle wearer. They make natural vision possible over all distances, just as was possible during one’s youth, so increasing personal well-being.

Apart from seeing naturally, the longsighted spectacle wearer expects quality, thin and light lenses, with enhanced aesthetic appeal.

A high-performance variable-focus lens has now been developed in the form of the be 4ty+® which, with its integral, technically optimised and intelligent design, fully meets individual customer requirements.

be 4ty+® offers:

• - the latest technology

• - natural vision owing to a broad viewing angle

• - optimum visual comfort when rapidly changing viewing angle

• - no swaying effects

• - best spontaneous tolerance

With integral optimised design

In developing the be 4ty+® integral optimised design, we were seeking to systematically balance and optimise the functional surfaces overall, allowing the wearer to benefit from homogeneous and natural vision over all distances.

Asphericity of distant vision

With variable-focus lens designs of the past, the asphericity of the distant vision was used to reduce peripheral surface astigmatism and in particular to keep maximum surface astigmatism to within a certain limit. With be 4ty+® we aimed to arrange the asphericity of distance vision as best to ensure the impression created by the asphericity.

The advantage for the wearer is increased aesthetics with outstanding definition in the long-distance zone. The breadth of the long-distance zone is arranged so that the wearer can also enjoy a broad and comfortable field of vision even with flatter form lenses.

With integral optimised design

In developing the be 4ty+® integral optimised design, we were seeking to systematically balance and optimise the functional surfaces overall, allowing the wearer to benefit from homogeneous and natural vision over all distances.

Asphericity of distant vision

With variable-focus lens designs of the past, the asphericity of the distant vision was used to reduce peripheral surface astigmatism and in particular to keep maximum surface astigmatism to within a certain limit. With be 4ty+® we aimed to arrange the asphericity of distance vision as best to ensure the impression created by the asphericity.

The advantage for the wearer is increased aesthetics with outstanding definition in the long-distance zone. The breadth of the long-distance zone is arranged so that the wearer can also enjoy a broad and comfortable field of vision even with flatter form lenses.

Eye and technology in harmony

Characteristics of astigmatism

Peripheral astigmatism, in particular the maximum value of the astigmatism, has so far always played a central role. The aim was to keep this maximum value as small as possible.With the development of be 4ty+® however, not only was the amount of the maximum astigmatism optimised, but also the surface distribution, as well as the location of the axis of the main section.

The distribution of the astigmatism over the periphery substantially determines the spontaneous tolerability of a variable-focus lens. By graduating the astigmatism it was possible to obtain a progressive transition with be 4ty+®. The high points are almost flattened out. That means a high spontaneous tolerability for the wearer without the well-known swaying effect.

Moreover, we concentrated on the adjustment of the main sector. It is extremely important for spatial perception that the periphery of the main sector of the astigmatic effect be horizontally or vertically aligned. The axes of the additional cylinders could be strongly horizontally aligned in the be 4ty+®.

Astigmatism (Plan, Add. 2.0)

Quality of vision that does as it promises

Designed according to the modern demands made of variable-focus lenses

Modern frames tend for the most part to be shallow in design and to offer only a limited area in which to accommodate the distance zone, the progression corridor and the near vision zone. Moreover, modern frames are adapted with a smaller distance from the corneal vertex and angle of inclination.

We derived these facts from representative statistics on the manufacture of individual variable-focus lenses. Both aspects – the flattened form of the lens and the altered adjustment – have been integrated into the design of the be 4ty+® thereby guaranteeing a design in keeping with the latest findings.

A variable-focus lens creates confidence

Aspheric functional surface

The be 4ty+® has an optimised aspheric front surface over the entire area of the lens. The possibilities for laying out the asphericity are, in connection with the mathematical procedure for describing the surface, so varied that the surface can be precisely determined over both large and small two-dimensional sectors.

The three-dimensional Splines function procedure used here has proved its worth not only with our variable-focus lenses but, for a long time now, in the high-tech industry for describing completely asymmetrical free forms, e.g. in the aircraft industry, for describing wing profiles.

BTPS – Binocular Tolerance of Prismatic Side-effects

For the binocular tolerance of a pair of spectacle lenses, it is important that the image perceived by the right and left eye be nearly identical. That, however, is not automatically the case with variable-focus lenses.

With be 4ty+® the prismatic side effects for eye movements of both lenses were harmonised in such a way that the prismatic differences caused lay below the perception threshold. This results in a fusion of the visual image of the right and left eye even with lateral eye movements.

Variable Inset

The progressive and close-up range of variable-focus lenses should accurately cover the visual fields of both eyes. Only in this way can the use by the wearer of the full width of the progressive and close-up ranges be ensured.

Since this requirement is met only if an effect and additional dependent view is used, be 4ty+® was equipped with a variable inset dependent on the remote and additional effect. The inset varies from 2.0 mm for severe short-sightedness with a smaller addition, up to 4.5 mm for severe long-sightedness with a high addition.

Success by stages

The development of be 4ty+® did not aim at redefining variable-focus lenses as such but rather at developing an optical lens which goes as far as possible towards meeting today‘s individual requirements.

The result:

A high-performance variable-focus lens using the latest technology which is best suited for first-time long-sighted users and those switching from other technologies. Specific trials in everyday practice have confirmed our success.

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