RONALD HARWERTH

Summary

Affiliation: University of Houston
Country: USA

Publications

  1. ncbi request reprint Visual field defects and neural losses from experimental glaucoma
    Ronald S Harwerth
    College of Optometry, University of Houston, 505 J Davis Armistead Building, TX 77204 2020, USA
    Prog Retin Eye Res 21:91-125. 2002
  2. ncbi request reprint Motor and sensory fusion in monkeys: psychophysical measurements
    R S Harwerth
    College of Optometry, University of Houston, TX 77204 6052, USA
    Eye (Lond) 10:209-16. 1996
  3. doi request reprint Age-related losses of retinal ganglion cells and axons
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
    Invest Ophthalmol Vis Sci 49:4437-43. 2008
  4. doi request reprint Charles F. Prentice Award Lecture 2006: a neuron doctrine for glaucoma
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
    Optom Vis Sci 85:436-44. 2008
  5. ncbi request reprint Modeling the effects of aging on retinal ganglion cell density and nerve fiber layer thickness
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, TX 77204 2020, USA
    Graefes Arch Clin Exp Ophthalmol 246:305-14. 2008
  6. ncbi request reprint The relationship between nerve fiber layer and perimetry measurements
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
    Invest Ophthalmol Vis Sci 48:763-73. 2007
  7. pmc Visual field defects and retinal ganglion cell losses in patients with glaucoma
    Ronald S Harwerth
    College of Optometry, University of Houston, Tex 77204 2020, USA
    Arch Ophthalmol 124:853-9. 2006
  8. pmc Linking structure and function in glaucoma
    R S Harwerth
    College of Optometry, University of Houston, 505 J Davis Armistead Building, Houston, TX 77204 2020, USA
    Prog Retin Eye Res 29:249-71. 2010
  9. ncbi request reprint Neural losses correlated with visual losses in clinical perimetry
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
    Invest Ophthalmol Vis Sci 45:3152-60. 2004
  10. ncbi request reprint Binocular vision with primary microstrabismus
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, Texas 77204, USA
    Invest Ophthalmol Vis Sci 44:4293-306. 2003

Research Grants

  1. BEHAVIORAL MEASURES OF BINOCULAR VISION
    RONALD HARWERTH; Fiscal Year: 2000
  2. BEHAVIORAL MEASURES OF BINOCULAR VISION
    RONALD HARWERTH; Fiscal Year: 2005
  3. Behavioral Measures of Vision
    RONALD HARWERTH; Fiscal Year: 2009
  4. Behavioral Measures of Vision
    Ronald S Harwerth; Fiscal Year: 2010
  5. BEHAVIORAL MEASURES OF BINOCULAR VISION
    RONALD HARWERTH; Fiscal Year: 1991
  6. BEHAVIORAL MEASURES OF BINOCULAR VISION
    RONALD HARWERTH; Fiscal Year: 1993
  7. BEHAVIORAL MEASURES OF BINOCULAR VISION
    RONALD HARWERTH; Fiscal Year: 1980
  8. Behavioral Measures of Vision
    RONALD HARWERTH; Fiscal Year: 2009

Detail Information

Publications31

  1. ncbi request reprint Visual field defects and neural losses from experimental glaucoma
    Ronald S Harwerth
    College of Optometry, University of Houston, 505 J Davis Armistead Building, TX 77204 2020, USA
    Prog Retin Eye Res 21:91-125. 2002
    ..These experimental findings from glaucoma in monkeys provide fundamental data that should be applicable to improving methods for assessing glaucomatous optic neuropathy in patients...
  2. ncbi request reprint Motor and sensory fusion in monkeys: psychophysical measurements
    R S Harwerth
    College of Optometry, University of Houston, TX 77204 6052, USA
    Eye (Lond) 10:209-16. 1996
    ..The stereo-deficiencies of these monkeys, along with other visual attributes, suggest that their binocular vision is a viable model for the binocularity of patients with subnormal binocular vision or the monofixation syndrome...
  3. doi request reprint Age-related losses of retinal ganglion cells and axons
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
    Invest Ophthalmol Vis Sci 49:4437-43. 2008
    ..The purpose of the present study was to determine whether the mechanisms of age-related losses that were suggested by the normative data can be confirmed with data from healthy, normal eyes...
  4. doi request reprint Charles F. Prentice Award Lecture 2006: a neuron doctrine for glaucoma
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
    Optom Vis Sci 85:436-44. 2008
    ..Thus, it was concluded that for individual patients, alterations in structure-function relationships usually should be in agreement for the degree and location of visual field defects caused by glaucoma...
  5. ncbi request reprint Modeling the effects of aging on retinal ganglion cell density and nerve fiber layer thickness
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, TX 77204 2020, USA
    Graefes Arch Clin Exp Ophthalmol 246:305-14. 2008
    ..Therefore, the present study was undertaken to reconcile the differences in age-dependency on measures of RGCs and axons that are incorporated in normative clinical data...
  6. ncbi request reprint The relationship between nerve fiber layer and perimetry measurements
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
    Invest Ophthalmol Vis Sci 48:763-73. 2007
    ....
  7. pmc Visual field defects and retinal ganglion cell losses in patients with glaucoma
    Ronald S Harwerth
    College of Optometry, University of Houston, Tex 77204 2020, USA
    Arch Ophthalmol 124:853-9. 2006
    ..To determine whether the structure-function relationships for glaucoma in humans and experimental glaucoma in monkeys are similar...
  8. pmc Linking structure and function in glaucoma
    R S Harwerth
    College of Optometry, University of Houston, 505 J Davis Armistead Building, Houston, TX 77204 2020, USA
    Prog Retin Eye Res 29:249-71. 2010
    ....
  9. ncbi request reprint Neural losses correlated with visual losses in clinical perimetry
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
    Invest Ophthalmol Vis Sci 45:3152-60. 2004
    ..The purpose of the present study was to investigate the neural and sensitivity losses from experimental glaucoma to establish the framework for a quantitative model for the structure-function relationships of standard clinical perimetry...
  10. ncbi request reprint Binocular vision with primary microstrabismus
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, Texas 77204, USA
    Invest Ophthalmol Vis Sci 44:4293-306. 2003
    ..The purpose of these experiments was to determine whether microstrabismic subjects have sensory abnormalities that could give rise to a small angle of strabismus...
  11. ncbi request reprint Temporal integration for stereoscopic vision
    Ronald S Harwerth
    College of Optometry, University of Houston, 505 J Davis Armistead Building, Houston, TX 77204 2020, USA
    Vision Res 43:505-17. 2003
    ..In addition, increased integration time does not account for the elevated stereothresholds of subjects with abnormal binocular vision...
  12. ncbi request reprint Stereopsis and disparity vergence in monkeys with subnormal binocular vision
    R S Harwerth
    College of Optometry, University of Houston, TX 72204 6052, USA
    Vision Res 37:483-93. 1997
    ....
  13. ncbi request reprint Progressive visual field defects from experimental glaucoma: measurements with white and colored stimuli
    R S Harwerth
    College of Optometry, University of Houston, Texas 77204 6052, USA
    Optom Vis Sci 76:558-70. 1999
    ..Our purpose was to study the effects of using monochromatic test stimuli to measure the relative rate of progression of visual field defects caused by experimental glaucoma...
  14. ncbi request reprint Ganglion cell losses underlying visual field defects from experimental glaucoma
    R S Harwerth
    College of Optometry, University of Houston, Texas 77204 6052, USA
    Invest Ophthalmol Vis Sci 40:2242-50. 1999
    ..To investigate the relationship between ganglion cell losses and visual field defects caused by glaucoma...
  15. pmc Effect of experimental glaucoma in primates on oscillatory potentials of the slow-sequence mfERG
    Nalini V Rangaswamy
    College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
    Invest Ophthalmol Vis Sci 47:753-67. 2006
    ..To determine the effect of experimental glaucoma in macaque monkeys on oscillatory potentials (OPs) in the slow-sequence multifocal electroretinogram (mfERG)...
  16. ncbi request reprint Binocular deficits associated with early alternating monocular defocus. II. Neurophysiological observations
    Bin Zhang
    College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
    J Neurophysiol 90:3012-23. 2003
    ....
  17. ncbi request reprint Directional bias of neurons in V1 and V2 of strabismic monkeys: temporal-to-nasal asymmetry?
    Ichiro Watanabe
    College of Optometry, University of Houston, TX 77204, USA
    Invest Ophthalmol Vis Sci 46:3899-905. 2005
    ..In the current study, the hypothesis that this eye movement anomaly reflects a similar asymmetry in the directional response properties of neurons in the early stages of cortical processing was examined...
  18. pmc Mechanisms of perceptual learning of depth discrimination in random dot stereograms
    Liat Gantz
    College of Optometry, University of Houston, 505 J Davis Armistead Building, Houston, TX 77204 2020, USA
    Vision Res 47:2170-8. 2007
    ..In two subjects, learning effects were retained over a period of six months, which may have application for training stereo deficient subjects...
  19. ncbi request reprint Stereoscopic depth magnitude estimation: effects of stimulus spatial frequency and eccentricity
    Patricia M Cisarik
    University of Houston, College of Optometry, 505 J Davis Armistead Building, Houston, TX 77004 2020, USA
    Behav Brain Res 160:88-98. 2005
    ..The lack of correlation between the perceptual and motor responses to the same stimuli suggests that the neural pathways for these responses diverge shortly after the detection of disparity in primary visual cortex...
  20. pmc Brief daily periods of unrestricted vision can prevent form-deprivation amblyopia
    Janice M Wensveen
    College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
    Invest Ophthalmol Vis Sci 47:2468-77. 2006
    ....
  21. ncbi request reprint Scaling the structure--function relationship for clinical perimetry
    Ronald S Harwerth
    College of Optometry, University of Houston, Houston, Texas 77096 2020, USA
    Acta Ophthalmol Scand 83:448-55. 2005
    ..The present study was undertaken to compare linear and logarithmic transformations, which have been proposed for correlating the perimetric defects and neural losses of glaucoma...
  22. ncbi request reprint Stereopsis is perturbed by vergence error
    Michael T Ukwade
    College of Optometry, University of Houston, Houston, TX 77204 2020, USA
    Vision Res 43:181-93. 2003
    ..Hence, the simulated vergence velocity is not the essential factor that limits stereopsis within Panum's fusional area. The results indicate that the stereothreshold is elevated if the vergence error exceeds a critical value...
  23. ncbi request reprint Stereothresholds with simulated vergence variability and constant error
    Michael T Ukwade
    College of Optometry, University of Houston, Houston, TX 77204 2020, USA
    Vision Res 43:195-204. 2003
    ..61. The results imply that vergence constant errors and vergence variability impair stereothresholds because of the resulting mean deviation from the horopter...
  24. ncbi request reprint Binocular deficits associated with early alternating monocular defocus. I. Behavioral observations
    Janice M Wensveen
    University of Houston, College of Optometry, Houston, Texas 77204 2020, USA
    J Neurophysiol 90:3001-11. 2003
    ....
  25. pmc Elevated albumin in retinas of monkeys with experimental glaucoma
    Louvenia Carter-Dawson
    Richard S Ruiz Department of Ophthalmology and Visual Science, University of Texas Medical School at Houston, Houston, Texas 77030, USA
    Invest Ophthalmol Vis Sci 51:952-9. 2010
    ....
  26. ncbi request reprint Glutathione content is altered in Müller cells of monkey eyes with experimental glaucoma
    Louvenia Carter-Dawson
    Department of Ophthalmology and Visual Science, University of Texas Houston Health Science Center, 6431 Fannin, Suite 7 024, Houston, TX 77030, USA
    Neurosci Lett 364:7-10. 2004
    ..The presence of more glutathione in Müller cells of glaucomatous retinas is consistent with an increase in extracellular glutamate and an increase in transport and metabolism of glutamate...
  27. ncbi request reprint Ocular dominance column width and contrast sensitivity in monkeys reared with strabismus or anisometropia
    Morris L J Crawford
    Department of Ophthalmology and Visual Science, University of Texas Health Science Center at Houston, Houston, Texas 77030, USA
    Invest Ophthalmol Vis Sci 45:3036-42. 2004
    ..To study the relationship between the width of ocular dominance columns in primary visual cortex and spatial contrast sensitivity functions in monkeys with strabismus or anisometropia during infancy...
  28. ncbi request reprint Stereoscopic acuity, observation distance and fixation disparity: a commentary on 'Stereoscopic acuity and observation distance' by Bradshaw and Glennerster (2006)
    Michael T Ukwade
    Premium Eyecare, 2402 F Bay Area Boulevard, Houston, Texas 77058, USA
    Spat Vis 20:489-92. 2007
  29. ncbi request reprint Vitreal glutamate concentration in monkeys with experimental glaucoma
    Louvenia Carter-Dawson
    Department of Ophthalmology and Visual Science, University of Texas Houston Health Science Center, Houston, Texas 77030, USA
    Invest Ophthalmol Vis Sci 43:2633-7. 2002
    ..To investigate the hypothesis that the pathophysiology for the death of retinal ganglion cells in glaucoma involves excitotoxic effects from elevated concentrations of vitreal glutamate...
  30. ncbi request reprint Adaptive optics scanning laser ophthalmoscopy for in vivo imaging of lamina cribrosa
    Abhiram S Vilupuru
    College of Optometry, University of Houston, TX 77204 2020, USA
    J Opt Soc Am A Opt Image Sci Vis 24:1417-25. 2007
    ..The AOSLO provides high-quality images of the lamina cribrosa and may have potential as a tool for early identification of glaucoma...
  31. doi request reprint The effects of interocular correlation and contrast on stereoscopic depth magnitude estimation
    Patricia M Cisarik
    Nova Southeastern University College of Optometry, Ft Lauderdale, Florida, USA
    Optom Vis Sci 85:164-73. 2008
    ..The present study investigated the effects of interocular correlation and contrast on the magnitude of perceived depth in suprathreshold random dot stereograms...

Research Grants32

  1. BEHAVIORAL MEASURES OF BINOCULAR VISION
    RONALD HARWERTH; Fiscal Year: 2000
    ....
  2. BEHAVIORAL MEASURES OF BINOCULAR VISION
    RONALD HARWERTH; Fiscal Year: 2005
    ..On the other hand, if normal stereopsis is necessary for the development of normal sensitivities to all depth cues, then the early treatment of binocular vision anomalies is paramount. ..
  3. Behavioral Measures of Vision
    RONALD HARWERTH; Fiscal Year: 2009
    ..This method of going from the laboratory to the clinic should maximize the potential for significant new information about ophthalmic testing for diagnosis and assessment of glaucoma. ..
  4. Behavioral Measures of Vision
    Ronald S Harwerth; Fiscal Year: 2010
    ..This method of going from the laboratory to the clinic should maximize the potential for significant new information about ophthalmic testing for diagnosis and assessment of glaucoma. ..
  5. BEHAVIORAL MEASURES OF BINOCULAR VISION
    RONALD HARWERTH; Fiscal Year: 1991
    ..Treatment strategies will also be devised and tested on some of the amblyopic monkeys...
  6. BEHAVIORAL MEASURES OF BINOCULAR VISION
    RONALD HARWERTH; Fiscal Year: 1993
    ..In addition, the results of these studies should provide new insights into the dysfunctions of binocular vision associated with strabismus and amblyopia in children...
  7. BEHAVIORAL MEASURES OF BINOCULAR VISION
    RONALD HARWERTH; Fiscal Year: 1980
    ..Similar experiments will be conducted on human amblyopes to determine the adequacy of the monkey as an animal model of naturally occurring amblyopia in humans. ..
  8. Behavioral Measures of Vision
    RONALD HARWERTH; Fiscal Year: 2009
    ..This method of going from the laboratory to the clinic should maximize the potential for significant new information about ophthalmic testing for diagnosis and assessment of glaucoma. ..