Visually relevant on-bench through-focus analysis of intraocular lenses

Area of Science:

• Ophthalmology
• Optical Engineering
• Visual Science

Background:

• Cataract surgery replaces the natural lens with an intraocular lens (IOL).
• Standard monofocal IOLs provide focus at one distance, often requiring spectacles for other tasks.
• Advanced IOLs like simultaneous vision IOLs (SVIOLs) and extended depth of focus (EDOF) aim to reduce spectacle dependence through multifocal or extended focus designs.

Purpose of the Study:

• To develop and introduce a visually relevant on-bench test method for evaluating IOLs.
• To assess the through-focus performance of various commercially available IOLs using a novel image analysis technique.
• To compare the performance of monofocal, enhanced monofocal, EDOF, and trifocal IOLs in a realistic eye model.

Main Methods:

• Utilized an eye model with different IOLs (monofocal, EDOF, trifocal).
• Recorded optotype images at varying vergence levels using a focus-tunable lens.
• Employed an image analysis technique and a visual acuity-related image quality metric for evaluation.

Main Results:

• The developed method provides a through-focus performance evaluation relevant to daily visual tasks.
• Comparison of different IOL designs (monofocal, EDOF, trifocal) was achieved.
• The test method addresses limitations of traditional optical testing (e.g., MTF) for assessing real-world visual performance.

Conclusions:

• The introduced on-bench test method offers a more functionally relevant assessment of IOL performance than traditional optical metrics.
• This technique aids in evaluating the visual quality and spectacle independence potential of advanced IOL designs.
• Further validation and application of this method can improve IOL selection and patient outcomes.