Cross Surface Design® (Double-sided Control Design)

What is Cross Surface Design® (Double-sided Control Design)

We have added new comfort elements to the usual reduction of sway and distortion, as well as widening the field of vision. We have done this in order to deliver even more natural and comfortable vision closer to that of the naked eye.
These are improvements to magnification for near-sight and improvements to the aspect ratio for near-sight.
In order to achieve this comfort, SEIKO has developed our new concept of
‘Cross Surface Design® (Double-sided Control Design)’ which controls both the front and back surfaces of the lens.

Sway and distortion

Progressive lenses cause partial distortions because of their peculiar characteristics.

Wearers of progressive lenses sense distortion changes and sway when shaking their faces from left to right while looking at an object.

Appearance of the near portion

With progressive lenses, the size of objects that can be seen and distortions vary in lenses for myopia and lenses for hyperopia. This also means that these lenses have different performance requirements.

People with myopia:
Hoping objects nearby to be seen wider and bigger.
People with hyperopia:
Hoping objects nearby to be seen less distortions.
Introduction of Cross Surface Design®

Magnification control

This is a new technology that reduces deviations in the actual size and shape of objects as well as improving vision by controlling the near curve on the front surface of the lens.

Near magnification is increased, objects are closer to their original size and at the same time the aspect ratio is improved by deepening the front surface of the near curve.

By making the front surface near curve shallower than the distance curve, the variation between distance and near magnification is further decreased than the back surface progressive and at the same time, the aspect ratio is improved so reducing sway and distortion.

Horizontal Atoric®

This is a new technology that deepens the horizontal curve against the curve in the front surface vertical curve, and so reduces sways and distortions. In the periphery, the curve gradually eases up and the increase in the thickness of the lens is suppressed.

By deepening the curve of the horizontal curve further than the vertical curve, sway and distortion have been reduced, and the aspect ratio has also been improved.

Improvement in near magnification

Lenses for people with myopia increase the near magnification and lenses for people with hyperopia suppress the near magnification. This means that the appearance of objects is even more natural and closer to that of when seen by the naked eye.

Improvement to the near acpect ratio*

Distortions in objects (difference in the aspect ratio) are compensated for when looking at objects through lenses.

aspect ratio = b / a

There is greater reduction in the vertical direction than the horizontal direction

There is greater expansion in the vertical direction than the horizontal direction

The aspect ratio of length and width is the ratio when looking at regular square objects with the near portion of progressive lenses. The closer the number is to ‘1,’ the more the object resembles the real thing.

Reduction in sway and distortion

It is possible to make it less likely to feel sway even when moving your face from left to right by reducing distortion.


Cross Surface Design® (Double-sided Control Design) has been incorporated for:

SEIKO Individual Lens SuperiorPX
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SEIKO Individual Lens PursuitPV
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SEIKO Individual Lens PursuitCV-X
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