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EDOF wavelength dependence

Donald Munro Donald Munro Follow Aug 19, 2018 · 2 mins read
EDOF wavelength dependence
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The latest paper from the research group at the David J Apple Lab has been accepted for future publication (in December later this year) in the influential American Journal of Ophthalmology,

The Effect of a Spectral Filter on Visual Quality in Patients with an Extended-Depth-Of-Focus Intraocular Lens

Grzegorz Łabuz, Gerd U. Auffarth, Aydin Özen, Thomas J.T.P. Van Den Berg, Timur M. Yildirim, Hyeck-Soo Son, and Ramin Khoramnia, American Journal of Ophthalmology (2019) Volume 208, December 2019, Pages 56-63, https://doi.org/10.1016/j.ajo.2019.07.001

Dr Łabuz summarised the research work,

We know that diffractive IOLs show wavelength dependence, but until now, this had not been assessed in vivo. So we examined 12 patients (23 eyes) who had received a Symfony lens (Johnson & Johnson Vision) – we measured them monocularly under red and white light at far, intermediate, and near distances. The patients’ corrected distance visual acuity (CDVA), distance-corrected intermediate visual acuity (DCIVA), and distance corrected near visual acuity (DCNVA) were all assessed. Contrast sensitivity was examined at several spatial frequencies. Then we looked in the laboratory, at the IOL’s modulation transfer function under different spectral conditions. We found,

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o CDVA was comparable under red and white light. DCIVA and DCNVA were significantly better under white light by 0.06 and 0.09, respectively.

o Contrast sensitivity was slightly better with a red filter at a far distance but was worse at an intermediate distance, although differences were significant only at 1 frequency.

o Near contrast sensitivity was better under polychromatic than red light, which was significant at 3 frequencies.

o The in vitro analysis confirmed Symfony’s wavelength dependence: performance was improved at a far distance but was worse at intermediate and near distances

Prof Auffarth added that these findings have clinical relevance. Symfony’s spectral dependence affects visual acuity and contrast sensitivity. Although the red filter did not improve distance vision, it caused visual deterioration at the near distance. Clinicians should keep this in mind and take this effect into account when optimizing the reading performance of patients with diffractive IOLs.

The authors wish to share this work and the publisher has created a Share Link – a URL providing 50 days’ free access to the article. Anyone clicking on this link before October 05, 2019 will be taken directly to the final version of the article on ScienceDirect.

Share Link:https://authors.elsevier.com/c/1Za1s_4HmJUbJ

You are welcome to read or download the paper for your own archive. No sign-up, registration or fees are required.

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Donald Munro
Written by Donald Munro Follow
Donald J. Munro is the Business Development Director of the Laboratory, University of Heidelberg.