June 2015
Volume 56, Issue 7
Free
ARVO Annual Meeting Abstract  |   June 2015
Can Aberrometry Provide Rapid and Reliable Measures of Subjective Depth of Focus following Multifocal Intraocular Lens Implantation?
Author Affiliations & Notes
  • Raymond A Applegate
    Visual Optics Inst/Coll of Optometry, University of Houston, Houston, TX
  • Sandeep K Dhallu
    Aston University, Birmingham, United Kingdom
  • Amy Louise Sheppard
    Aston University, Birmingham, United Kingdom
  • Toshifumi Mihashi
    Tokyo Institute of Technology, Tokyo, Japan
  • Tom Drew
    Aston University, Birmingham, United Kingdom
  • Sunil Shah
    Opthalmology, Birmingham Midland Eye Centre, Birmingham, United Kingdom
  • James Stuart Wolffsohn
    Aston University, Birmingham, United Kingdom
  • Footnotes
    Commercial Relationships Raymond Applegate, University of Houston (P); Sandeep Dhallu, None; Amy Sheppard, None; Toshifumi Mihashi, Topcon (F); Tom Drew, None; Sunil Shah, LensAR (F), Lenstec (F), Refocus (F); James Wolffsohn, Johnson and Johnson (F)
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2015, Vol.56, 2979. doi:
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      Raymond A Applegate, Sandeep K Dhallu, Amy Louise Sheppard, Toshifumi Mihashi, Tom Drew, Sunil Shah, James Stuart Wolffsohn; Can Aberrometry Provide Rapid and Reliable Measures of Subjective Depth of Focus following Multifocal Intraocular Lens Implantation?. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):2979.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: To determine whether the ‘through-focus’ aberrations of a multifocal and accommodative intraocular lens (IOL) implanted patient can be used to provide rapid and reliable measures of their subjective range of clear vision.

Methods: Eyes that had been implanted with a concentric (n = 8), segmented (n = 10) or accommodating (n = 6) intraocular lenses (mean age 62.9 ± 8.9 years; range 46-79 years) for over a year underwent simultaneous monocular subjective (electronic logMAR test chart at 4m with letters randomised between presentations) and objective (Aston open-field aberrometer) defocus curve testing for levels of defocus between +1.50 to -5.00DS in -0.50DS steps, in a randomised order. Pupil size and ocular aberration (a combination of the patient’s and the defocus inducing lens aberrations) at each level of blur was measured by the aberrometer. Visual acuity was measured subjectively at each level of defocus to determine the traditional defocus curve. Objective acuity was predicted using image quality metrics.

Results: The range of clear focus differed between the three IOL types (F=15.506, P=0.001) as well as between subjective and objective defocus curves (F=6.685, p=0.049). There was no statistically significant difference between subjective and objective defocus curves in the segmented or concentric ring MIOL group (P>0.05). However a difference was found between the two measures and the accommodating IOL group (P<0.001). Mean Delta logMAR (predicted minus measured logMAR) across all target vergences was -0.06 ± 0.19 logMAR. Predicted logMAR defocus curves for the multifocal IOLs did not show a near vision addition peak, unlike the subjective measurement of visual acuity. However, there was a strong positive correlation between measured and predicted logMAR for all three IOLs (Pearson’s correlation: P<0.001).

Conclusions: Current subjective procedures are lengthy and do not enable important additional measures such as defocus curves under differently luminance or contrast levels to be assessed, which may limit our understanding of MIOL performance in real-world conditions. In general objective aberrometry measures correlated well with the subjective assessment indicating the relative robustness of this technique in evaluating post-operative success with segmented and concentric ring MIOL.

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