Huang Ching-Yao, Raasch Thomas W, Yi Allen Y, Bullimore Mark A
Department of Optometry, Shu Zen Junior College of Medicine and Management, Kaohsiung, Taiwan.
Optom Vis Sci. 2013 Jun;90(6):565-75. doi: 10.1097/OPX.0b013e3182923ff6.
To compare the optical properties of five state-of-the-art progressive addition lenses (PALs) by direct physical measurement of surface shape.
Five contemporary freeform PALs (Varilux Comfort Enhanced, Varilux Physio Enhanced, Hoya Lifestyle, Shamir Autograph, and Zeiss Individual) with plano distance power and a +2.00-diopter add were measured with a coordinate measuring machine. The front and back surface heights were physically measured, and the optical properties of each surface, and their combination, were calculated with custom MATLAB routines. Surface shape was described as the sum of Zernike polynomials. Progressive addition lenses were represented as contour plots of spherical equivalent power, cylindrical power, and higher order aberrations (HOAs). Maximum power rate, minimum 1.00-DC corridor width, percentage of lens area with less than 1.00 DC, and root mean square of HOAs were also compared.
Comfort Enhanced and Physio Enhanced have freeform front surfaces, Shamir Autograph and Zeiss Individual have freeform back surfaces, and Hoya Lifestyle has freeform properties on both surfaces. However, the overall optical properties are similar, regardless of the lens design. The maximum power rate is between 0.08 and 0.12 diopters per millimeter and the minimum corridor width is between 8 and 11 mm. For a 40-mm lens diameter, the percentage of lens area with less than 1.00 DC is between 64 and 76%. The third-order Zernike terms are the dominant high-order terms in HOAs (78 to 93% of overall shape variance). Higher order aberrations are higher along the corridor area and around the near zone. The maximum root mean square of HOAs based on a 4.5-mm pupil size around the corridor area is between 0.05 and 0.06 µm.
This nonoptical method using a coordinate measuring machine can be used to evaluate a PAL by surface height measurements, with the optical properties directly related to its front and back surface designs.
通过直接物理测量表面形状来比较五种最先进的渐进多焦点镜片（PAL）的光学特性。
使用坐标测量机对五款当代自由曲面PAL（Varilux Comfort Enhanced、Varilux Physio Enhanced、Hoya Lifestyle、Shamir Autograph和Zeiss Individual）进行测量，这些镜片的远用屈光度为平光，附加光度为+2.00屈光度。对镜片的前表面和后表面高度进行物理测量，并使用自定义的MATLAB程序计算每个表面及其组合的光学特性。表面形状用泽尼克多项式之和来描述。渐进多焦点镜片用球镜等效度数、柱镜度数和高阶像差（HOA）的等高线图表示。还比较了最大功率变化率、最小1.00-DC通道宽度、小于1.00 DC的镜片面积百分比以及HOA的均方根。
Comfort Enhanced和Physio Enhanced的前表面为自由曲面，Shamir Autograph和Zeiss Individual的后表面为自由曲面，Hoya Lifestyle的前后表面均具有自由曲面特性。然而，无论镜片设计如何，整体光学特性相似。最大功率变化率在每毫米0.08至0.12屈光度之间，最小通道宽度在8至11毫米之间。对于直径40毫米的镜片，小于1.00 DC的镜片面积百分比在64%至76%之间。三阶泽尼克项是HOA中的主要高阶项（占整体形状方差的78%至93%）。高阶像差在通道区域和近用区域周围较高。基于通道区域周围4.5毫米瞳孔大小的HOA最大均方根在0.05至0.06微米之间。
这种使用坐标测量机的非光学方法可通过表面高度测量来评估PAL，其光学特性与其前表面和后表面设计直接相关。
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