Mr. Richard James Copland Profile

Richard James Copland

at Wavefront Dynamics

SPIE Involvement:

Author

Publications (9)

SPIE Journal Paper | 30 November 2022 Open Access

Dynamic aberrometer/topographer designed for clinical measurement and treatment of highly aberrated eyes

Daniel Neal, Xifeng Xiao, Richard Copland, Lyle Kordonowy, Dan Hamrick, Daniel Medina, John Dixson, Phillip Riera, Paul Pulaski, Tristan Turner, Jeff Kolberg, Ron Rammage, Steve Farrer, Dean Rusk, Matt Haugo

OE, Vol. 61, Issue 12, 121808, (November 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.12.121808

KEYWORDS: Equipment, Eye, Wavefronts, Refraction, Wavefront sensors, Cornea, Optical spheres, Optical engineering, Monochromatic aberrations, Imaging systems

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The human eye is a complex optical system with multiple elements. It is aspheric, nonsymmetric, and time dependent; yet, overall it has incredible performance. There have been various instruments developed over the years to measure and then to guide treatment to correct for ocular aberrations. As the development of these instruments (and treatments) has progressed, we have sought to correct more difficult cases, which may be more aberrated, time-dependent, or difficult in some other way. To this end, we have developed a new dynamic aberrometer that expands the boundaries of measurement capability with the aim of measuring and treating more difficult cases. This aberrometer has been designed that incorporates high-resolution Shack–Hartmann wavefront sensing, full gradient (spot) corneal topography, dynamic acquisition, and a subjective digital refractometer. This instrument is designed to measure extremely high aberrations and to provide information for treatment in multiple modalities. A small clinical study was conducted with subjects ranging from 23 to 64 years old to evaluate the effectiveness of the dynamic analysis at selecting a refraction. Examples are presented for measurements with keratoconus, irregular corneas, and tear-film irregularity. In the clinical study, young subjects showed an overall +0.27 D reduction in instrument induced myopia using dynamic measurement compared to a snapshot. The instrument has a large dynamic range for measuring subjects with keratoconus and other aberrated corneal conditions. The new instrument is effective at providing information needed for treatment in multiple modalities. The subjective digital refractometer corrects the fixation target for the objectively measured low-order aberrations (defocus and astigmatism). This provides immediate subjective feedback on the objective refraction and, with the ability to manually adjust the refraction parameters, the ability to compare objective and subjective refractions in the same setting.

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Proceedings Article | 14 October 2004 Paper

Measurement of lens focal length using multicurvature analysis of Shack-Hartmann wavefront data

Daniel Neal, R. James Copland, David Neal, Daniel Topa, Phillip Riera

Proceedings Volume 5523, (2004) https://doi.org/10.1117/12.561772

KEYWORDS: Wavefront sensors, Wavefronts, Distance measurement, Collimation, Error analysis, Sensors, Monochromatic aberrations, Charge-coupled devices, Manufacturing, Optical testing

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Proceedings Article | 11 November 2002 Paper

Application of Shack-Hartmann wavefront sensing technology to transmissive optic metrology

Ron Rammage, Daniel Neal, Richard Copland

Proceedings Volume 4779, (2002) https://doi.org/10.1117/12.451734

KEYWORDS: Wavefront sensors, Wavefronts, Sensors, Optical testing, Spatial resolution, Light sources, Contact lenses, Cameras, Refraction, Water

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Proceedings Article | 11 November 2002 Paper

Shack-Hartmann wavefront sensor precision and accuracy

Daniel Neal, James Copland, David Neal

Proceedings Volume 4779, (2002) https://doi.org/10.1117/12.450850

KEYWORDS: Wavefronts, Sensors, Wavefront sensors, Error analysis, Detector arrays, Cameras, Charge-coupled devices, Calibration, Standards development, CCD image sensors

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Proceedings Article | 7 June 2001 Paper

Effect of lenslet resolution on the accuracy of ocular wavefront measurements

Daniel Neal, Daniel Topa, James Copland

Proceedings Volume 4245, (2001) https://doi.org/10.1117/12.429285

KEYWORDS: Wavefronts, Eye, Wavefront sensors, Zernike polynomials, Optical spheres, Optical resolution, Adaptive optics, Deformable mirrors, Sensors, Charge-coupled devices

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Proceedings Article | 7 April 1999 Paper

Finite element thermal analysis of multispectral coatings for the ABL

Rashmi Shah, Jerry Bettis, Alan Stewart, Lynn Bonsall, James Copland, William Hughes, Juan Echeverry

Proceedings Volume 3578, (1999) https://doi.org/10.1117/12.344391

KEYWORDS: Absorption, Silicon, Zerodur, Diffusion, Temperature metrology, Semiconducting wafers, Optical coatings, Calorimetry, Laser damage threshold, Finite element methods

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Proceedings Article | 7 April 1999 Paper

Laser damage in multispectral optical coatings for the ABL

Alan Stewart, Lynn Bonsall, Jerry Bettis, James Copland, Keith Healey, Gerald Charlton, William Hughes, Juan Echeverry

Proceedings Volume 3578, (1999) https://doi.org/10.1117/12.344403

KEYWORDS: Absorption, Laser induced damage, Zerodur, Optical coatings, Reflectivity, RADICL, Silicon, Chemical oxygen iodine lasers, Diffusion, Temperature metrology

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Proceedings Article | 12 May 1998 Paper

Quantitative determination of oxygen yield in a chemical oxygen-iodine laser

Kip Kendrick, Charles Helms, Brian Quillen, R. Copland

Proceedings Volume 3268, (1998) https://doi.org/10.1117/12.308058

KEYWORDS: Oxygen, Calibration, Chemical lasers, Absorption, RADICL, Chemical oxygen iodine lasers, Diagnostics, Throat, Chlorine, Airborne laser technology

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Proceedings Article | 31 March 1995 Paper

Iodine dissociation in chemical oxygen-iodine lasers (COILs)

Charles Helms, J. Shaw, Gordon Hager, Keith Truesdell, David Plummer, R. Copland

Proceedings Volume 2502, (1995) https://doi.org/10.1117/12.204920

KEYWORDS: Iodine, Chemical lasers, Chemical oxygen iodine lasers, RADICL, Oxygen, Helium, Chlorine, Argon ion lasers, Absorption, Diagnostics

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Showing 5 of 9 publications

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