PROGRESSIVE ADDITION LENS
First Claim
1. A progressive addition lens comprising:
- a near portion having a power for viewing a near field;
a distance portion having a power for viewing a distance field further than the near field; and
an intermediate portion connecting the distance portion and the near portion,whereinthe progressive addition lens includes an aspherical object-side surface and an aspherical eyeball-side surface,the object-side surface is formed in rotational symmetry with respect to a center of design of the progressive addition lens,the object-side surface includes a first stable region formed in rotational symmetry with respect to the center of design and including the center of design, and an aspherical region arranged outside of the first stable region so as to contact the first stable region and formed in rotational symmetry with respect to the center of design, anda PV value (Peak to Valley) of a mean surface refractive power in the first stable region is 0.12 D or less.
1 Assignment
0 Petitions
Accused Products
Abstract
Progressive addition lens includes a near portion having a power for viewing a near field, a distance portion having a power for viewing a distance field further than the near field, and an intermediate portion connecting the distance portion and the near portion. The progressive addition lens includes an aspherical object-side surface and an aspherical eyeball-side surface and is formed in rotational symmetry with respect to a center of design of the progressive addition lens. The object-side surface includes a first stable region formed in rotational symmetry with respect to the center of design and including the center of design, and an aspherical region arranged outside of the first stable region to contact the first stable region and formed in rotational symmetry with respect to the center of design. A Peak to Valley value of a mean surface refractive power in the first stable region is 0.12 D or less.
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Citations
12 Claims
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1. A progressive addition lens comprising:
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a near portion having a power for viewing a near field; a distance portion having a power for viewing a distance field further than the near field; and an intermediate portion connecting the distance portion and the near portion, wherein the progressive addition lens includes an aspherical object-side surface and an aspherical eyeball-side surface, the object-side surface is formed in rotational symmetry with respect to a center of design of the progressive addition lens, the object-side surface includes a first stable region formed in rotational symmetry with respect to the center of design and including the center of design, and an aspherical region arranged outside of the first stable region so as to contact the first stable region and formed in rotational symmetry with respect to the center of design, and a PV value (Peak to Valley) of a mean surface refractive power in the first stable region is 0.12 D or less. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification