| 摘要 |
A double-progressive spectacle lens in which the progressive action is distributed over the front and rear surfaces of the double-progressive spectacle lenses and described by the quotient Q <?in-line-formulae description="In-line Formulae" end="lead"?>Q=Add<SUB>vfl</SUB>/Add<SUB>Gesamt</SUB><?in-line-formulae description="In-line Formulae" end="tail"?> where Add<SUB>vfl </SUB>represents the increase in the surface dioptric power along the principal line on the front surface between the distance area and the near area, and ADD<SUB>Gesamt </SUB>represents the increase in the total dioptric power along the principal line between the distance area and the near area, and the fraction Q increases with growing distance area effect F: <maths id="MATH-US-00001" num="00001"> <MATH OVERFLOW="SCROLL"> <MROW> <MFRAC> <MROW> <MO>ⅆ</MO> <MROW> <MI>Q</MI> <MO></MO> <MROW> <MO>(</MO> <MI>F</MI> <MO>)</MO> </MROW> </MROW> </MROW> <MROW> <MO>ⅆ</MO> <MI>F</MI> </MROW> </MFRAC> <MO>⩾</MO> <MN>0.</MN> </MROW> </MATH> </MATHS>
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