AN OPHTHALMIC PROGRESSIVE ADDITION LENS FOR A MYOPIC OR EMMETROPIC PRESBYOPIC WEARER; METHOD FOR PROVIDING SUCH A LENS
An ophthalmic progressive addition lens for a myopic or emmetropic presbyopic wearer which has a prescribed far vision mean refractive power, a non nil prescribed ADDp, said lens having a far vision reference point, a mean refractive power, PPO([alpha], [beta]), a module of resulting astigmatism, AS...
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Main Authors | , , , , , , , , |
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Format | Patent |
Language | Chinese English |
Published |
08.06.2018
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Subjects | |
Online Access | Get full text |
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Summary: | An ophthalmic progressive addition lens for a myopic or emmetropic presbyopic wearer which has a prescribed far vision mean refractive power, a non nil prescribed ADDp, said lens having a far vision reference point, a mean refractive power, PPO([alpha], [beta]), a module of resulting astigmatism, ASR([alpha], [beta]), a meridian line, ML([alpha], [beta]), said ([alpha], [beta]) functions being determined in as-worn conditions of the lens by the wearer for gaze directions ([alpha], [beta]) joining the center of rotation of the eye, CRE, and the lens, where [alpha] is a lowering angle in degreeand [beta] is an azimuth angle in degree, and wherein a lens criterion, A1/A2, fulfils following requirement: A1/A2 >= 0.50, where: A1 = [alpha]100%-[alpha]85%; A2=[alpha]100% -[alpha]60%.
种用于近视眼或正视眼且老花眼配戴者的渐变多焦点眼科镜片,所述镜片具有处方视远平均屈光力、非零处方下加光ADD,所述镜片具有视远参考点、平均屈光力PPO(α,β)、结果散光模数ASR(α,β)、子午线ML(α,β),所述(α,β)函数是在所述配戴者戴着所述镜片的条件下针对将眼睛的转动中心CRE与所述镜片相连的注视方向(α,β)确定的,其中α是以度为单位的降低角,并且β是以度为单位的方位角,并且其中镜片指标A1/A2满足以下要求:A1/A2≥0.50,其中:o A1=α1 |
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Bibliography: | Application Number: CN201680060207 |