Abstract: A progressive addition lens includes a portion having a power for viewing a near field, a portion having a power for viewing a distance field further than the near field, and an 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 PV value (Peak to Valley) of a mean surface refractive power in the first stable region is 0.12 D or less.

Abstract: A method of making a pair of spectacle lenses which may reduce induced binocular vision distortions where wearer and frame metrics and a lens class are inputted into a computer program, and the computer program determines the left and right lens front curve radius in which there is a substantially linear relationship between the rate of change of lateral vergence and degree of ocular rotation and then adjusts the left and right lens front curve radius and the left and right lens center thickness such that the lateral inter-ocular static magnification target value is between about ?3% and about +3% in the lateral plane and the stimulus to near vergence is within the wearer's vergence limits. The computer program then determines a left and right lens index of refraction and a left and right lens material and the generated lens parameters are then used to machine the spectacle lenses.