Double-sided Aspheric Design

Double-sided Aspheric Design

The world' first "Double-sided Aspheric design" developed by SEIKO is a revolutionary design technique that enables the creation of a thin, lightweight lens that provides outstanding optical performance.

The "Low base curve + Double-sided Aspheric design" not only makes it possible to produce thin, lightweight lenses, but also achieves balanced correction of power discrepancies and astigmatism at the lens periphery, which is a phenomena that causes degraded optical performance.

Thanks to this achievement, a sharp, clear field of vision is guaranteed from edge to edge of the lens. We truly hope that you will try for yourself the "high quality" and "gentle to the eyes" spectacle lenses made possible by SEIKO, the pioneer of the aspheric lens.

Customers for whom Double-sided Aspheric Design is recommended

For people looking for high quality

A Double-sided Aspheric design lens that boasts both high-level "optical performance" and "thinness" through use of [Double-sided Aspheric design] and [Ultra-refractive index material].
This lens achieving a "natural field of vision" close to that of the naked eye with outstanding "thinness."
The ultimate lens for those always looking for high-quality facewear.

For people looking for thin, lightweight lens

"Thin" and "light" to meet the demands of users.
The Double-sided Aspheric design lens achieves major improvements in both thinness and lightness by incorporation of [Double-sided Aspheric design] and [ultra-refractive material], and the 1.74 refractive index material lens in particular achieves an amazing "thinness" and "lightness" that makes the user forget he/she is actually wearing spectacles.

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For people with strong astigmatism

On ordinary aspheric lenses, only the "front side curve" is aspheric with a spherical "back side curve" for correction of astigmatism, resulting in residual aberration in the field of vision.
However, the Double-sided Aspheric design lens features aspheric design in both the "back and front side curves," resulting in improvement in aberration in the astigmatic direction to achieve a "natural field of vision."

Description
Spherical design lens Aspheric design lens Double-sided Aspheric design lens
Spherical design lens Aspheric design lens Double-sided Aspheric design lens
The lens features spherical curves on both the front and back surfaces. The design features an aspheric curve on the front lens surface. The aspheric design results in a thin and lightweight lens. The world's first advanced design featuring aspheric curves on both the front and back surfaces. The aspheric design is incorporated on both sides of the lens, resulting in noticeably thinner and lightweight lenses.
Natural comfortable vision

The "Double-sided Aspheric design" first developed by SEIKO ensures a sharp, clear field of vision from edge to edge of the lens with little distortion or blurring. This is an advanced-design lens that provides natural vision alleviating tiredness and giveing the wearer a true feeling of comfort.

Lens with astigmatic power: Image of vision

Double-sided Aspheric design has been incorporated for:

SEIKO near sight, far sight and astigmatism A-ZONE 1.74/1.64/1.60
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SEIKO near sight, far sight and astigmatism SPG AZ
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SEIKO near sight, far sight and astigmatism SSV AZ
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SEIKO near sight, far sight and astigmatism SLU AZ
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