July 2019
Volume 60, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2019
Optimization of the light sword optical element (LSOE) for presbyopia correction
Author Affiliations & Notes
  • Walter Torres
    Grupo de Óptica y Fotónica, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Antioquia, Colombia
  • Alejandro Mira-Agudelo
    Grupo de Óptica y Fotónica, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Antioquia, Colombia
  • John Fredy Barrera
    Grupo de Óptica y Fotónica, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Antioquia, Colombia
  • Andrzej Kolodziejczyk
    Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662, Warsaw, Poland
  • Footnotes
    Commercial Relationships   Walter Torres, None; Alejandro Mira-Agudelo, None; John Fredy Barrera, None; Andrzej Kolodziejczyk, None
  • Footnotes
    Support  Universidad de Antioquia UdeA research grant No. 2017-15770
Investigative Ophthalmology & Visual Science July 2019, Vol.60, 3724. doi:https://doi.org/
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      Walter Torres, Alejandro Mira-Agudelo, John Fredy Barrera, Andrzej Kolodziejczyk; Optimization of the light sword optical element (LSOE) for presbyopia correction. Invest. Ophthalmol. Vis. Sci. 2019;60(9):3724. doi: https://doi.org/.

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

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Abstract

Purpose : the LSOE has been previously evaluated as presbyopia corrector, showing a good performance in near and intermediate vision but a lower correction quality for far vision. The aim of this work is to study some modifications of the LSOE to obtain a suitable profile that provides a better performance for far vision, keeping a good behavior for the other optical powers

Methods : the proposed modifications of the LSOE consist of assigning a window of the optical power 0 D designed for far vision and rescaling the original profile in the remaining area of the element. Angular and circular windows shapes are proposed and 8 modified LSOE profiles are tested: 4 for angular windows with angles β=30°, 45°, 60° and 90°, and 4 with circular windows of radii ρ=0.25R, 0.3R, 0.36R and 0.4R (R is the radius of the complete profile: 6mm). Defocus curves of Strehl ratio values were used to simulate the performance of the redesigned LSOEs. A monocular visual simulator was used for objective and subjective testing of the modified LSOEs. For objective test, correlation coefficient and Michelson’s contrast defocus curves were determined using a Snellen optotype and an USAF test respectively, both imaged by the modified profiles. Finally, 3 LSOE profiles (β=45°, 90° and ρ=0.36R) were subjectively tested providing monocular visual acuity (VA) and contrast sensitivity (CS) defocus curves for 6 subjects (3 women, 3 men): age 25 to 39; average refraction −0.46±1.30 D and average astigmatism −0,34±0,17 D. Presbyopia was mimicked by using 1% Tropicamide drops. The tested defocus range was [-4, +1] D

Results : the computational simulations and objective experiments confirmed a better performance of the modified LSOE for far vision (defocus of 0 D). VA defocus curves also show a clear improvement provided by the tested LSOEs at 0 D. The difference between the naked eye and the corrected eye at 0 D was (in logMAR) 0.24, 0.14 and 0.08 for the original LSOE and the modified LSOE with β=90° and ρ=0.36R respectively. A flat shape in VA curve was found in the rest of optical powers. CS shows a similar behavior, with a slight advantage of the angular window in respect of the radial one

Conclusions : the optimized LSOEs provide a better performance for distance vision than the original design, preserving a good behavior in near and intermediate vision, what validates suitable features of the modified LSOE for presbyopia correction

This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.

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