Z-View diffractive wavefront sensor: principle and applications

Liu, Yueai; Warden, Laurence; Dillon, Keith; Mills, Gary L.; Dreher, Andreas W.

doi:10.1117/12.669248

Cited by 4 publications

(5 citation statements)

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“…18 The Z-Wave aberrometer is based on a proprietary holographic grating system that does not use Hartmann-Shack technology. 19 According to the manufacturer, the system can measure optical aberrations in the Zernike 3rd to 6th order, measures more than 11 300 points over a 6.0 mm pupil, and is applicable to refractive errors between À11.00 D of myopia and C5.00 D of hyperopia.…”

Section: Methodsmentioning

confidence: 99%

Optical aberrations in professional baseball players

Kirschen¹,

Laby²,

Kirschen³

et al. 2010

Journal of Cataract and Refractive Surgery

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Professional baseball players have small higher-order optical aberrations when tested with naturally dilated pupils. No clinically significant differences were found between the 2 aberrometers. Statistically significant differences in trefoil were found between the players and the control population; however, the difference was clinically insignificant. It seems as though the visual system of professional baseball players is limited by lower-order aberrations and that the smaller HOAs do not enhance visual function over that in a control population.

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Section: Methodsmentioning

confidence: 99%

Optical aberrations in professional baseball players

Kirschen¹,

Laby²,

Kirschen³

et al. 2010

Journal of Cataract and Refractive Surgery

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“…Neglecting magnification for simplicity for a Shack-Hartmann sensor, 21 we have d ¼ f, the focal length of the lenslets. For a Talbot sensor, 17 d ¼ z T ¼ 2P 2 ∕λ, the Talbot distance for the sensor, where λ is the wavelength of the light (assuming the detector is at the first Talbot plane, otherwise incorporate an appropriate integer for the plane used). Figure 4 shows a simulated example depicting the result of a Talbot sensor with a sinusoidal grating pattern, as well as a Shack-Hartmann sensor with an equal pitch.…”

Section: Methodsmentioning

confidence: 99%

“…A potentially cheaper high-density option 15 is grating-based sensors, such as those that utilize the Talbot effect. 16,17 These can easily use grating patterns with a very small pitch (equivalent to a high-density array), which can be produced by simply etching the grating onto a glass slide attached to the detector.…”

Section: Introductionmentioning

confidence: 99%

Fast and robust estimation of ophthalmic wavefront aberrations

Dillon

2016

J. Biomed. Opt

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Rapidly rising levels of myopia, particularly in the developing world, have led to an increased need for inexpensive and automated approaches to optometry. A simple and robust technique is provided for estimating major ophthalmic aberrations using a gradient-based wavefront sensor. The approach is based on the use of numerical calculations to produce diverse combinations of phase components, followed by Fourier transforms to calculate the coefficients. The approach does not utilize phase unwrapping nor iterative solution of inverse problems. This makes the method very fast and tolerant to image artifacts, which do not need to be detected and masked or interpolated as is needed in other techniques. These features make it a promising algorithm on which to base low-cost devices for applications that may have limited access to expert maintenance and operation.

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“…[10][11][12] The governing mathematical equations are re-stated here for the completeness of the analysis in this presentation.…”

Section: Wavefront Sensing Principlementioning

confidence: 99%

“…[8][9][10][11] Based on the Talbot selfimaging effect, a periodic grating is self-imaged at planes at various Talbot distances behind the grating without the aid of any imaging device. The aberration in the incident wavefront will affect the fidelity of the Talbot image to the grating distribution, and hence, is able to be extracted through the numerical analysis of one of the Talbot images.…”

Section: Introductionmentioning

confidence: 99%

A novel high-resolution and large-range diffractive wavefront sensor

Liu¹,

Warden²,

Dillon³

et al. 2006

SPIE Proceedings

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Based on the Talbot self-imaging principle, a diffraction-based wavefront sensor, the Z-View TM wavefront sensor, has been developed at Ophthonix Inc. According to the Talbot effect, a periodic grating can be self-imaged at certain distances behind the grating, commonly known as Talbot distances, without the aid of any imaging device. The fidelity of the Talbot image to the grating pattern is affected by the wavefront aberration in the illumination beam. Therefore, the wavefront distortion can be retrieved through numerical analysis of the Talbot image. Unlike the well-known Shack-Hartmann wavefront sensor, where a group of pixels on the camera is responsible for only one wavefront data point, each camera pixel in the Z-View wavefront sensor has a corresponding wavefront data. The Z-View wavefront sensor measures the wavefront at 1024 x 1048 data points, and can achieve a dynamic range of wavefront curvature of 20 diopters. The Z-View wavefront sensor has been successfully used for wavefront sensing in ophthalmic aberrometry, adaptive optics, and lensometry at Ophthonix.

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Z-View diffractive wavefront sensor: principle and applications

Cited by 4 publications

References 0 publications

Optical aberrations in professional baseball players

Optical aberrations in professional baseball players

Fast and robust estimation of ophthalmic wavefront aberrations

A novel high-resolution and large-range diffractive wavefront sensor

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