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Session Title: Multifocal Technology and Comparative studies
Session Date/Time: Tuesday 08/10/2013 | 08:00-10:30
Paper Time: 08:12
Venue: Auditorium (First Floor)
First Author: : S.MacRae USA
Co Author(s): : L. Zheleznyak H. Jung G. Yoon Salgado-Borges
To investigate the impact of manipulating the pupils amplitude apodization function on through-focus visual performance in the presbyopic eye with extended depth of focus with spherical aberration (SA).
Flaum Eye Institute, University of Rochester, Rochester, NY
Through-focus image quality with SA was evaluated with optical bench testing and visual performance measurements in monochromatic light (550nm). The optical bench system consisted of a model eye with phase-plate induced SA, a liquid crystal spatial light modulator to control pupil apodization, and a camera for imaging a tumbling E letter chart. Through-focus image quality was quantified by calculating the correlation coefficient between a reference image (without SA and apodization) and captured through-focus images (0 to 2.5D with 0.1D step). Pupil apodization was modeled as a Gaussian function. An adaptive-optics vision simulator was used to measure through-focus visual acuity (VA) in 4 cyclopleged subjects (0 to 3D with 1D step). Spherical aberration induced over the subjects native higher order aberrations with phase plates. Both optical bench testing and visual performance were carried out with ±0.2µm SA induction over a 4mm artificial pupil. Diffractive multifocals were also modeled using the simulator as well.
In the optical bench test, introducing amplitude apodization improved distance image quality regardless of sign of SA. Amplitude apodization improved through-focus image quality for the model eye with negative SA at all object distances. However, in the presence of positive SA, amplitude apodization reduced intermediate and near image quality. Distance VA was not significantly impacted by pupil amplitude apodization with both signs of SA. Through-focus VA was improved due to amplitude apodization for the case of negative SA by 0.6, 0.5 and 0.8 lines of logMAR acuity at 1, 2 and 3 D, respectively. Theoretical image quality simulation modeling on diffractive multifocals showed similar improvements in visual benefits. Alternatively, through-focus VA with positive SA degraded by 0.1, 0.8 and 0.2 lines of logMAR acuity at 1, 2 and 3 D, respectively.
Pupil amplitude apodization led to a significant improvement in through-focus image quality, especially with negative SA. Similar improvement may be feasible with diffractive multifocals based on image quality simulation. These findings also suggest that halos and glare induced by multifocal presbyopic corrections can be reduced with appropriate pupil amplitude apodization.
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