Borish I M, Hitzeman S A, Brookman K E
J Am Optom Assoc. 1980 Oct;51(10):933-43.
Fifty-four patients, selected to encompass the full range of bifocal additions were involved in a double masked study of Varilux II and Ultravue progressive addition lenses in which neither patient in or examiner knew the type of lens prescribed at a given trial. Measurements of width of near field were taken with each type prior to and following wearing periods of one month each. Subjects had complete freedom to select or substitute a form of bifocal of their own choice without extra costs. The paper indicates the selections made, and considers the variables influencing these choices. The final results imply that acceptance of variable focus lenses may rest more with the bias of the practitioner than the readiness of the patient.
54名患者参与了一项关于Varilux II和Ultravue渐进多焦点镜片的双盲研究，这些患者的双焦点附加度数涵盖了全部范围，在给定的试验中，患者和检查者都不知道所配镜片的类型。在每次佩戴一个月的前后，分别用每种类型的镜片测量近用视野宽度。受试者可以完全自由地选择或替换他们自己选择的双焦点镜片形式，无需额外付费。本文指出了所做的选择，并考虑了影响这些选择的变量。最终结果表明，患者对可变焦点镜片的接受程度可能更多地取决于从业者的偏见，而非患者的意愿。
