Faculty Publications
Permanent link for this collectionhttps://hdl.handle.net/2022/601
Published works by School of Optometry faculty.
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Item Non-strabismic Vision Therapy Lecture and Lab(2013) Goss, David A.This file contains outlines of lectures and the lab manual on vision therapy for non-strabismic accommodation and binocular vision disorders in a course given at the Indiana University School of Optometry between 2005 and 2013.Item Accommodation and Vergence Testing Procedures(Indiana University School of Optometry, 2015-08) Goss, David A.This is the 2015 version of a lab manual used by the author from 2003 to 2015 to teach procedures for testing ocular accommodation and convergence to second year optometry students.Item Effect of test sequence on fusional vergence ranges(New England Journal of Optometry, 1995) Goss, DavidBackground. Vergence adaptation or prism adaptation is a well-known phenomenon, but the effect of testing order on fusional vergence ranges has not been widely studied. Methods. Sixty-two patients had fusional vergence ranges taken with rotary prisms in either a base-in, base-out, base-in order or a base-out, base-in, base-out order. Results. The results showed statistically significant reductions in some fusional vergence range findings as a result of preceding fusional vergence range testing. Base-in findings were affected more often by base-out testing than vice-versa. The most consistent change was a reduction in the distance base-in break of 1 to 3 prism diopters when it followed base-out testing. Conclusions. This study supports the recommendation in some texts that the effects of vergence adaptation on fusional vergence test findings can be minimized by performing base-in tests before base-out. However, these effects are generally small in amount.Item Testing of Lagrange multiplier damped least-squares control algorithm for woofer-tweeter adaptive optics(The Optical Society of America, 2012) Zou, W.; Burns, S.A.A Lagrange multiplier-based damped least-squares control algorithm for woofer-tweeter (W-T) dual deformable-mirror (DM) adaptive optics (AO) is tested with a breadboard system. We show that the algorithm can complementarily command the two DMs to correct wavefront aberrations within a single optimization process: the woofer DM correcting the high-stroke, low-order aberrations, and the tweeter DMcorrecting the low-stroke, high-order aberrations. The optimal damping factor for a DMis found to be the median of the eigenvalue spectrum of the influence matrix of that DM.Wavefront control accuracy is maximized with the optimized control parameters. For the breadboard system, the residual wavefront error can be controlled to the precision of 0.03 μm in root mean square. The W-T dual-DM AO has applications in both ophthalmology and astronomyItem Phase-sensitive imaging of the outer retina using optical coherence tomography and adaptive optics(The Optical Society of America, 2012) Jonnal, R.S.; Kocaoglu, O.P.; Wang, Q.; Lee, S.; Miller, D.T.The cone photoreceptor's outer segment (OS) experiences changes in optical path length, both in response to visible stimuli and as a matter of its daily course of renewal and shedding. These changes are of interest, to quantify function in healthy cells and assess dysfunction in diseased ones. While optical coherence tomography (OCT), combined with adaptive optics (AO), has permitted unprecedented three-dimensional resolution in the living retina, it has not generally been able to measure these OS dynamics, whose scale is smaller than OCT's axial resolution of a few microns. A possible solution is to take advantage of the phase information encoded in the OCT signal. Phase-sensitive implementationsof spectral-domain optical coherence tomography (SD-OCT) have been demonstrated, capable of resolving sample axial displacements much smaller than the imaging wavelength, but these have been limited to ex vivo samples. In this paper we present a novel technique for retrieving phase information from OCT volumes of the outer retina. The key component of our technique is quantification of phase differences within the retina. We provide a quantitative analysis of such phase information and show that- when combined with appropriate methods for filtering and unwrapping-it can improve the sensitivity to OS length change by more than an order of magnitude, down to 45 nm, slightly thicker than a single OS disc. We further show that phase sensitivity drops off with retinal eccentricity, and that the best location for phase imaging is close to the fovea. We apply the technique to the measurement of sub-resolution changes in the OS over matters of hours. Using custom software for registration and tracking, these microscopic changes are monitored in hundreds of cones over time. In two subjects, the OS was found to have average elongation rates of 150 nm/hr, values which agree with our previous findings.Item The use of forward scatter to improve retinal vascular imaging with an adaptive optics scanning laser ophthalmoscope(The Optical Society of America, 2012) Chui, T.Y.P.; VanNasdale, D.A.; Burns, S.A.Retinal vascular diseases are a leading cause of blindness and visual disability. The advent of adaptive optics retinal imaging has enabled us to image the retinal vascular at cellular resolutions, but imaging of the vasculature can be difficult due to the complex nature of the images, including features of many other retinal structures, such as the nerve fiber layer, glial and other cells. In this paper we show that varying the size and centration of the confocal aperture of an adaptive optics scanning laser ophthalmoscope (AOSLO) can increase sensitivity to multiply scattered light, especially light forward scattered from the vasculature and erythrocytes. The resulting technique was tested by imaging regions with different retinal tissue reflectivities as well as within the optic nerve head.Item Frederic A. Woll (1874-1955), Optometric Practitioner, Educator, and Author(Optometric Historical Society, 2011-04) Goss, David A.Frederic Albert Woll (1874-1955) had a distinguished career in optometry and as a member of the faculty in the Department of Hygiene at City College of New York. Woll was an optometry instructor for many years at Columbia University and wrote four books significant in optometry. He played a pivotal role in the establishment of standards in optometric education and in the evaluation of optometry schools in the 1920s and 1930s.Item E. Leroy Ryer (1880-1972) and Elmer E. Hotaling (1887-1950), optometric leaders and authors, and partners in optometry practice.(Optometric Historical Society, 2011-04) Goss, David A.E. LeRoy Ryer and Elmer E. Hotaling were very prominent optometrists of the first half of the twentieth century and made numerous contributions to the profession. They were among the early pioneers of professional optometry practice. They published many articles in optometry journals, and did work in instrument design. They were charter members of the American Academy of Optometry in 1922, Ryer having suggested such an organization in 1905. In the first decade of the twentieth century, they were briefly faculty members in a two-year optometry school, an unusual length of study for the time. This paper presents brief biographical sketches of each, along with discussion of the two books they coauthored, Optometric Procedure and Ophthalmometry. The former book contained much of their views on how optometry should be practiced.Item Retinal Image-Mediated Ocular Growth as a Possible Etiological Factor in Juvenile-Onset Myopia(Indiana University, 1988) Goss, David A.Item The Accommodation and Convergence Graph and the Zone of Clear Single Binocular Vision(Indiana University, 2010) Goss, David A.