Correction of the aberrations in the human eye with a liquid-crystal spatial light modulator: limits to performance

Vargas-Martı́n, Fernando; Prieto, Pedro M.; Artal, Pablo

doi:10.1364/josaa.15.002552

Cited by 148 publications

(79 citation statements)

References 20 publications

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“…Many deformable mirrors technologies such as mechanical mirrors with piezoelectric actuators, liquid crystal spatial light modulators, micro-electro-mechanical-system (MEMS) deformable mirrors, etc. [6][7][8][9] have been investigated for active phase compensation. Mechanical DMs are typically bulky and expensive, and not scalable to large number of actuators.…”

Section: Introductionmentioning

confidence: 99%

High-resolution adaptive optics scanning laser ophthalmoscope with dual deformable mirrors

Chen¹,

Jones²,

Silva³

et al. 2007

J. Opt. Soc. Am. A

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Adaptive optics scanning laser ophthalmoscope (AO SLO) has demonstrated superior optical quality of non-invasive view of the living retina, but with limited capability of aberration compensation. In this paper, we demonstrate that the use of dual deformable mirrors can effectively compensate large aberrations in the human retina. We used a bimorph mirror to correct large-stroke, low-order aberrations and a MEMS mirror to correct low-stroke, high-order aberration. The measured ocular RMS wavefront error of a test subject was 240 nm without AO compensation. We were able to reduce the RMS wavefront error to 90 nm in clinical settings using one deformable mirror for the phase compensation and further reduced the wavefront error to 48 nm using two deformable mirrors. Compared with that of a single-deformable-mirror SLO system, dual AO SLO offers much improved dynamic range and better correction of the wavefront aberrations. The use of large-stroke deformable mirrors provided the system with the capability of axial sectioning different layers of the retina. We have achieved diffraction-limited in-vivo retinal images of targeted retinal layers such as photoreceptor layer, blood vessel layer and nerve fiber layers with the combined phase compensation of the two deformable mirrors in the AOSLO.

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Section: Introductionmentioning

confidence: 99%

High-resolution adaptive optics scanning laser ophthalmoscope with dual deformable mirrors

Chen¹,

Jones²,

Silva³

et al. 2007

J. Opt. Soc. Am. A

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“…Table 1 contains a short summary of the devices which have been used in vision science applications to date. Although LC SLM's have the advantage of high spatial resolution, they have proven complex to calibrate and have the disadvantage of dependence on the wavelength and polarization of the incident light [16,17]. For this reason, most researchers have built their AO systems around a DM.…”

Section: Introductionmentioning

confidence: 99%

Characterization for vision science applications of a bimorph deformable mirror using phase-shifting interferometry

Horsley

Park

Laut

et al. 2005

Ophthalmic Technologies XV

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The wave front corrector is one of the three key elements in adaptive optics, along with the wave front sensor and the control computer. Low cost, compact deformable mirrors are increasingly available. We have tested the AOptix bimorph deformable mirror, originally developed for ultra-high bandwidth laser communication systems, to determine its suitability for vision science applications, where cornea and lens introduce optical aberrations. Measurements of the dynamic response of the mirror to a step input were obtained using a commercial Laser Doppler Vibrometer (LDV). A computer-controlled Twyman-Green interferometer was constructed to allow the surface height of the deformable mirror to be measured using Phase-Shifting Interferometry as a function of various control voltages. A simple open-loop control method was used to compute the control voltages required to generate aberration mode shapes described by the Zernike polynomials. Using this method, the ability of the deformable mirror to generate each mode shape was characterized by measuring the maximum amplitude and RMS error of each Zernike mode shape up to the fifth radial order. The maximum deformation amplitude was found to diminish with the square of the radial order of the Zernike mode, with a measured deformation of 8 microns and 1.5 microns achieved at the second-order and fifth-order Zernike modes, respectively. This deformation amplitude appears to be sufficient to allow the mirror to correct for aberrations up to the fifth order in the human eye.

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“…astronomy and retinal imaging as wavefront correction devices This paper reports an optimum method for the [7][8][9]. Recent [3] or transmissive [10][11] pixel pads. The compact, highly reliable, and electronically-controlled and modulation of an incident light beam is performed through the software-configured.…”

mentioning

confidence: 99%

Optimization of Liquid-Crystal Spatial Light Modulator for Precise Phase Generation

Eng

Cai

Wang

et al. 2006

2006 Conference on Optoelectronic and Microelectronic Materials and Devices

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In an adaptive optical system in retinal imaging, the phase amplitude modulation effects in order to maximize the contrast modulation capability of an SLM is employed such that the of reconstructed phase holograms. We also investigated the device dynamically corrects the phase error of the measured feasibility of determining the optical surface uniformity of the ocular wavefront to attain perfect visual acuity. Through the LC-SLM through computations of the interference fringes, and computations of an optimum conjugated wavefront, the identified the disadvantages of this method. This new approach reconstructed optical wavefront is then applied onto the SLM may be used to determine the optical surface quality of other as a phase hologram.optical devices.

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Correction of the aberrations in the human eye with a liquid-crystal spatial light modulator: limits to performance

Cited by 148 publications

References 20 publications

High-resolution adaptive optics scanning laser ophthalmoscope with dual deformable mirrors

High-resolution adaptive optics scanning laser ophthalmoscope with dual deformable mirrors

Characterization for vision science applications of a bimorph deformable mirror using phase-shifting interferometry

Optimization of Liquid-Crystal Spatial Light Modulator for Precise Phase Generation

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