Purpose

As presbyopia occurs, new visual demands create a need for clear vision at multiple distances. Many spectacle wearers adapt into progressive addition lenses (PAL) in order to see clearly at distance, intermediate, and near. A multifocal contact lens provides the ability to see at these same distances without the prismatic effects of a spectacle lens or the peripheral obstruction of a spectacle frame. No studies have been done to date comparing the effect of these types of presbyopic vision correction on a variety of tests of visual performance representative of everyday tasks.

Methods

A battery of visual performance tasks were completed by subjects while wearing their habitual PAL spectacles. These subjects were then fit with a multifocal contact lens and wore lenses for 2 weeks or more before completing the tasks again. These functional vision tests included assessments of coincidence anticipation timing, peripheral search and hand-eye coordination, and dynamic visual acuity. Following functional vision testing, subjects completed a preference survey comparing both types of refractive correction while performing common activities of daily living.

Results

Performance on the majority of the tests of visual performance were equivalent (P < 0.05) when comparing PAL spectacles and multifocal contact lenses. Survey results demonstrated a preference for multifocal contact lenses overall.

Conclusion

PAL spectacles are widely prescribed for presbyopic patients. The findings of this study suggest that in addition to providing excellent vision, multifocal contact lenses provide functional vision performance equal to PAL spectacle wear and patients may prefer them over PAL spectacles.

中文翻译：

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多焦点隐形眼镜和渐进眼镜的视觉表现

目的

随着老花眼的出现，新的视觉需求产生了对多个距离清晰视觉的需求。许多眼镜佩戴者适应了渐进镜片 (PAL)，以便在远处、中间和近处看清楚。多焦点隐形眼镜提供了在这些相同距离处看到的能力，而没有眼镜镜片的棱镜效应或眼镜架的外围障碍。迄今为止，还没有研究比较这些类型的老花视力矫正对代表日常任务的各种视觉性能测试的影响。

方法

受试者在佩戴他们习惯性的 PAL 眼镜时完成了一系列视觉表现任务。然后这些受试者佩戴多焦点隐形眼镜并佩戴镜片 2 周或更长时间，然后再次完成任务。这些功能性视力测试包括对重合预期时间、周边搜索和手眼协调以及动态视力的评估。在功能性视力测试之后，受试者完成了一项偏好调查，比较两种类型的屈光矫正，同时进行日常的常见活动。

结果

在比较 PAL 眼镜和多焦点隐形眼镜时，大多数视觉性能测试的性能是相同的 (P < 0.05)。调查结果表明总体上偏爱多焦点隐形眼镜。

结论

PAL 眼镜被广泛用于老花眼患者。这项研究的结果表明，除了提供出色的视力外，多焦点隐形眼镜还提供与 PAL 眼镜佩戴相同的功能性视力表现，并且患者可能更喜欢它们而不是 PAL 眼镜。