Knorz M C, Seiberth V, Ruf M, Lorger C V, Liesenhoff H
University Eye Hospital, Klinikum Mannheim, Germany.
Ophthalmologica. 1996;210(3):155-9. doi: 10.1159/000310697.
Bifocal intraocular lenses (BIOLs) reduce image contrast. We measured contrast sensitivity (CS) to evaluate the clinical significance of the loss in image contrast. Four groups were compared: 15 patients with a monofocal IOL, 13 with the True Vista BIOL, 13 with the AcuraSee BIOL, 11 with the diffractive BIOL. CS was measured using the Mentor B-VAT II-SG. Distance CS was slightly better in monofocal eyes than in all bifocal eyes, and distance CS was considerably better than near CS in eyes with the True Vista or the AcuraSee BIOL. With the diffractive BIOL, values were about the same at distance and near focus. Our results demonstrate that BIOLs reduce CS. thereby performing differently: both True Vista and AcuraSee favor distance vision, while the diffractive BIOL provides about the same contrast at distance and near focus.
双焦点人工晶状体（BIOL）会降低图像对比度。我们测量了对比敏感度（CS）以评估图像对比度降低的临床意义。比较了四组：15名单焦点人工晶状体患者、13名使用True Vista BIOL的患者、13名使用AcuraSee BIOL的患者、11名使用衍射型BIOL的患者。使用Mentor B-VAT II-SG测量CS。单焦点眼的远距离CS略优于所有双焦点眼，使用True Vista或AcuraSee BIOL的眼睛中，远距离CS明显优于近距离CS。对于衍射型BIOL，远距离和近焦点处的值大致相同。我们的结果表明，BIOL会降低CS，从而表现出不同的特性：True Vista和AcuraSee都有利于远距离视力，而衍射型BIOL在远距离和近焦点处提供大致相同的对比度。
