Optimization of the Light Sword Lens for Presbyopia Correction
| Autor: | John Fredy Barrera-Ramírez, Walter Torres-Sepúlveda, Krzysztof Petelczyc, Andrzej Kolodziejczyk, Alejandro Mira-Agudelo |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Depth of focus Computer science media_common.quotation_subject Biomedical Engineering Visual Acuity Article optical corrections and treatments law.invention Contrast Sensitivity 03 medical and health sciences 0302 clinical medicine law Lens Crystalline medicine Contrast (vision) Humans Computer vision psychophysical assessment Dioptre media_common Lenses Intraocular Monocular business.industry Strehl ratio Presbyopia medicine.disease Vergence (optics) Lens (optics) visual optics Ophthalmology 030104 developmental biology 030221 ophthalmology & optometry Artificial intelligence business |
| Zdroj: | Translational Vision Science & Technology |
| ISSN: | 2164-2591 |
| Popis: | Purpose We propose and evaluate the modifications of a light sword lens (LSL) to obtain better performance for distance vision while maintaining good operation for near and intermediate vision. Methods The modifications consisted of assigning angular or circular windows for distance vision while rescaling the LSL profile in the remaining area of the element. The objective performance of the redesigned LSLs was verified numerically by the Strehl ratio and experimentally using correlation coefficients and Michelson contrast. Subjective assessments were provided by monocular visual acuity (VA) and contrast sensitivity (CS) through-focus curves for six patients with paralyzed accommodation. The tested object vergence range was [-4.0, 0.0] diopters (D). All experiments were conducted in a custom-made monocular visual simulator. Results Computational simulations and objective experiments confirmed the better performance of the modified LSL for the imaging of distant objects. The proposed angular and radial modulations resulted in flat VA and CS through-focus curves, indicating more uniform quality of vision with clearly improved distance vision. The VA provided by the modified LSL profiles showed a maximal improvement of 1.5 lines of acuity with respect to the VA provided by the conventional LSL at distance vision. Conclusions Optimized LSLs provide better imaging of distant objects while maintaining a large depth of focus. This results in comparable and acceptable quality for distance, intermediate, and near vision. Therefore, the modified LSLs appear to be promising presbyopia correctors. Translational relevance The new design of LSL reveals an improved performance for all ranges of vision and becomes a promissory element for a real presbyopia correction in clinical applications. |
| Databáze: | OpenAIRE |
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