Spectacle lens, spectacles, and method for manufacturing spectacle lens
Spectacle lenses that allow a wearer to view an object in a more comfortable manner include a pair of lenses for the left and right eyes. The power of one of the pair of lenses is shifted toward the positive side with respect to the power of the other lens, and object-side average surface power (base curve) of the one lens is smaller than object-side average surface power (base curve) of the other lens. The power (dioptric power) is principal meridian power along a principal meridian of each of the lenses, and the base curve is in the direction along the principal meridian.
1. Spectacle lenses comprising:
a first lens comprising a distance portion and a near portion; and
a second lens comprising a distance portion and a near portion, wherein
the first lens and the second lens are progressive lenses whose distance portion and near portion have different dioptric powers, and
a dioptric power of the distance portion of the second lens is larger than a dioptric power of the distance portion of the first lens, and an object-side average surface power of the distance portion of the second lens is smaller than an object-side average surface power of the distance portion of the first lens.
2. The spectacle lenses according to claim 1 , wherein a dioptric power of the near portion of the second lens is larger than a dioptric power of the near portion of the first lens, and an object-side average surface power of the near portion of the second lens is smaller than an object-side average surface power of the near portion of the first lens.
3. The spectacle lenses according to claim 1 , wherein
at least one of the first lens and the second lens has an object-side surface whose distance portion and near portion have different average surface powers, and
when the dioptric power of the near portion is larger than the dioptric power of the distance portion, the object-side average surface power of the near portion is smaller than the object-side average surface power of the distance portion, whereas when the dioptric power of the near portion is smaller than the dioptric power of the distance portion, the object-side average surface power of the near portion is greater than the object-side average surface power of the distance portion.
4. Spectacle lenses comprising:
a first lens comprising a distance portion and a near portion; and
a second lens comprising a distance portion and a near portion, wherein
the first lens and the second lens are progressive lenses whose distance portion and near portion have different dioptric powers, and
a dioptric power of the near portion of the second lens is larger than a dioptric power of the near portion of the first lens, and an object-side average surface power of the near portion of the second lens is smaller than an object-side average surface power of the near portion of the first lens.
5. A spectacles comprising:
a first lens comprising a distance portion and a near portion;
a second lens comprising a distance portion and a near portion; and
a spectacle frame to which the first lens and the second lens are attached, wherein
a dioptric power of the distance portion of the second lens is larger than a dioptric power of the distance portion of the first lens, and
an object-side average surface power of the distance portion of the second lens is smaller than an object-side average surface power of the distance portion of the first lens.
6. A spectacles comprising:
a first lens comprising a distance portion and a near portion;
a second lens comprising a distance portion and a near portion; and
a spectacle frame to which the first lens and the second lens are attached, wherein
a dioptric power of the near portion of second lens is larger than a dioptric power of the near portion of the first lens, and
an object-side average surface power of the near portion of the second lens is smaller than an object-side average surface power of the near portion of the first lens.