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Small-aperture devices like the IC-8 intraocular lens (IOL) provide an extended depth of focus (EDOF) and reduce optical aberrations from peripheral light rays. They were introduced for the correction of presbyopia. As they also provide a remarkable tolerance for residual refractive errors, particularly for astigmatism, they are now also used in situations where IOL power calculation is challenging, that is, after corneal refractive surgery. The EDOF capability leads to excellent results after monocular and also binocular implantation. Patient satisfaction is high and the safety record does not differ from other monofocal IOLs. The Xtrafocus is placed in front of an IOL implanted in the capsular bag and acts as a mask blocking peripheral light thus extending the depth of focus. The IC-8 IOL and the Xtrafocus mask can both also be used to improve vision in eyes with irregular astigmatism due to ecstatic disease, trauma, or previous surgery.

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EDOF Lenses: Types and Models—Type 2: EDOF IOLs and Masks Based on the Small-Aperture Effect of the Apthera and the Xtrafocus Device

  • 章节

  • 发表日期：

    2026年

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  • H. Burkhard Dick,
  • Suphi Taneri

摘要

Small-aperture devices like the IC-8 intraocular lens (IOL) provide an extended depth of focus (EDOF) and reduce optical aberrations from peripheral light rays. They were introduced for the correction of presbyopia. As they also provide a remarkable tolerance for residual refractive errors, particularly for astigmatism, they are now also used in situations where IOL power calculation is challenging, that is, after corneal refractive surgery. The EDOF capability leads to excellent results after monocular and also binocular implantation. Patient satisfaction is high and the safety record does not differ from other monofocal IOLs. The Xtrafocus is placed in front of an IOL implanted in the capsular bag and acts as a mask blocking peripheral light thus extending the depth of focus. The IC-8 IOL and the Xtrafocus mask can both also be used to improve vision in eyes with irregular astigmatism due to ecstatic disease, trauma, or previous surgery.