Ferrer-Blasco Teresa, Madrid-Costa David
Optometry Research Group (GIO), Optics Department, University of Valencia, Valencia, Spain.
Optom Vis Sci. 2010 Sep;87(9):E663-8. doi: 10.1097/OPX.0b013e3181eb98b9.
To evaluate near stereoacuity (SA) with Focus Progressives and PureVision Multifocal simultaneous vision contact lenses.
In a cross-over study design, 20 presbyopic subjects were fitted with either the Focus Progressives or PureVision Multifocal lenses. After 1 month, SA was measured with the vectographic Titmus, Random dot stereotests, and the Howard-Dolman apparatus under photopic conditions (85 lux) at 40 cm. Binocular high-contrast visual acuity at distance and near was examined. Subjects were then refitted with the alternative correction and the procedure was repeated.
Mean SA with the Focus Progressive was 21 +/- 7 sec arc, 54 +/- 17 sec arc, and 51 +/- 21 sec arc, with the Howard-Dolman, Titmus, and Random dot sterereotests, respectively. These values were 25 +/- 9 sec arc, 74 +/- 26 sec arc, and 82 +/- 26 sec arc with the PureVision Multifocal, respectively. SA was better with the Focus Progressives compared with the PureVision using the Howard-Dolman (4 sec arc of difference; p = 0.001), Titmus (2 sec arc of difference; p = 0.001), and Random dot (31 sec arc of difference; p < 0.001) tests. Binocular mean high-contrast distance visual acuity was similar for the Focus Progressives and PureVision Multifocal: -0.01 +/- 0.07 and +0.02 +/- 0.08 logMAR, respectively (p = 0.074). At near vision, these values were +0.01 +/- 0.07 and +0.06 +/- 0.06 logMAR, respectively, being statistically significant different (p = 0.004).
Both the Focus Progressive and PureVision Multifocal contact lenses provided good visual acuity preserving stereopsis. Focus Progressives had slightly better near acuity and better SA than the Purevision Multifocal contact lenses. Differences found between the lens types may be related to asphericity, near addition of the contact lens, or even visual acuity differences between the two eyes that were not measured in this study but could conceivably have contributed to SA measure differences. SA measurement with a Howard-Dolman apparatus reveals better SA than vectographic tests.
评估使用Focus Progressives渐进多焦点镜片和PureVision多焦点同步视觉隐形眼镜时的近立体视锐度（SA）。
在一项交叉研究设计中，20名老花眼受试者分别佩戴Focus Progressives或PureVision多焦点镜片。1个月后，在明视条件下（85勒克斯）、40厘米距离处，使用矢量图Titmus、随机点立体视测试和霍华德-多尔曼仪器测量SA。检查双眼远、近距离的高对比度视力。然后为受试者重新佩戴另一种矫正镜片，并重复该过程。
使用霍华德-多尔曼、Titmus和随机点立体视测试时，Focus Progressives镜片的平均SA分别为21±7秒弧度、54±17秒弧度和51±21秒弧度。使用PureVision多焦点镜片时，这些值分别为25±9秒弧度、74±26秒弧度和82±26秒弧度。与PureVision镜片相比，使用霍华德-多尔曼测试（相差4秒弧度；p = 0.001）、Titmus测试（相差2秒弧度；p = 0.001）和随机点测试（相差31秒弧度；p < 0.001）时，Focus Progressives镜片的SA更好。Focus Progressives镜片和PureVision多焦点镜片的双眼平均高对比度远距离视力相似：分别为-0.01±0.07和+0.02±0.08 logMAR（p = 0.074）。在近距离视力方面，这些值分别为+0.01±0.07和+0.06±0.06 logMAR，差异具有统计学意义（p = 0.004）。
Focus Progressives渐进多焦点镜片和PureVision多焦点隐形眼镜均能提供良好的视力并保留立体视。Focus Progressives渐进多焦点镜片的近视力和SA略优于PureVision多焦点隐形眼镜。两种镜片类型之间的差异可能与非球面性、隐形眼镜的近附加光度有关，甚至可能与本研究未测量的双眼视力差异有关，但可以想象这些差异可能导致了SA测量的差异。使用霍华德-多尔曼仪器测量SA比矢量图测试显示出更好的SA。
