D R Iskander

Summary

Affiliation: Queensland University of Technology
Country: Australia

Publications

  1. ncbi request reprint Computational aspects of the visual Strehl ratio
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove, QLD 4059, Australia
    Optom Vis Sci 83:57-9. 2006
  2. ncbi request reprint Optimal modeling of corneal surfaces with Zernike polynomials
    D R Iskander
    Centre for Eye Research, Queensland University of Technology, Victoria Park Rd, Kelvin Grove Q4059, Australia
    IEEE Trans Biomed Eng 48:87-95. 2001
  3. ncbi request reprint The skew ray ambiguity in the analysis of videokeratoscopic data
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia
    Optom Vis Sci 84:435-42. 2007
  4. ncbi request reprint Extrapolation of central corneal topography into the periphery
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove 4059, Brisbane, Australia
    Eye Contact Lens 33:293-9. 2007
  5. ncbi request reprint Dynamics in longitudinal eye movements and corneal shape
    D Robert Iskander
    School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove Q4059, Brisbane, QLD, Australia
    Ophthalmic Physiol Opt 26:572-9. 2006
  6. ncbi request reprint A parametric approach to measuring limbus corneae from digital images
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia
    IEEE Trans Biomed Eng 53:1134-40. 2006
  7. doi request reprint Modeling videokeratoscopic height data with spherical harmonics
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia
    Optom Vis Sci 86:542-7. 2009
  8. ncbi request reprint Evaluating tear film stability in the human eye with high-speed videokeratoscopy
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia
    IEEE Trans Biomed Eng 52:1939-49. 2005
  9. ncbi request reprint Applications of high-speed videokeratoscopy
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove, QLD 4059, Australia
    Clin Exp Optom 88:223-31. 2005
  10. doi request reprint The statistics of refractive error maps: managing wavefront aberration analysis without Zernike polynomials
    D Robert Iskander
    School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove, QLD, Australia
    Ophthalmic Physiol Opt 29:292-9. 2009

Detail Information

Publications35

  1. ncbi request reprint Computational aspects of the visual Strehl ratio
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove, QLD 4059, Australia
    Optom Vis Sci 83:57-9. 2006
    ..The recently defined visual Strehl ratio that is based on the optical transfer function (VSOTF) has a number of previously unidentified limitations in its calculation that need to be addressed...
  2. ncbi request reprint Optimal modeling of corneal surfaces with Zernike polynomials
    D R Iskander
    Centre for Eye Research, Queensland University of Technology, Victoria Park Rd, Kelvin Grove Q4059, Australia
    IEEE Trans Biomed Eng 48:87-95. 2001
    ..The optimal model order varies as a function of the diameter of the cornea...
  3. ncbi request reprint The skew ray ambiguity in the analysis of videokeratoscopic data
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia
    Optom Vis Sci 84:435-42. 2007
    ..However, the effect of skew ray ambiguity in ray tracing through videokeratoscopic data has not been studied in depth...
  4. ncbi request reprint Extrapolation of central corneal topography into the periphery
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove 4059, Brisbane, Australia
    Eye Contact Lens 33:293-9. 2007
    ..To investigate the errors associated with extrapolating the topography of the central cornea into the peripheral cornea...
  5. ncbi request reprint Dynamics in longitudinal eye movements and corneal shape
    D Robert Iskander
    School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove Q4059, Brisbane, QLD, Australia
    Ophthalmic Physiol Opt 26:572-9. 2006
    ..Understanding the nature of such changes will be of benefit in ophthalmic applications requiring highly accurate measurements of corneal shape, such as contact lens design and refractive surgery...
  6. ncbi request reprint A parametric approach to measuring limbus corneae from digital images
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia
    IEEE Trans Biomed Eng 53:1134-40. 2006
    ..Initial clinical experiments showed close agreement between the proposed approach and limbus corneae estimates manually obtained by experienced clinicians...
  7. doi request reprint Modeling videokeratoscopic height data with spherical harmonics
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia
    Optom Vis Sci 86:542-7. 2009
    ..The purpose of this study was to ascertain the applicability of an object-centered representation to modeling of corneal surfaces...
  8. ncbi request reprint Evaluating tear film stability in the human eye with high-speed videokeratoscopy
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia
    IEEE Trans Biomed Eng 52:1939-49. 2005
    ....
  9. ncbi request reprint Applications of high-speed videokeratoscopy
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove, QLD 4059, Australia
    Clin Exp Optom 88:223-31. 2005
    ..The limitations and potential opportunities for the use of this new technology are discussed...
  10. doi request reprint The statistics of refractive error maps: managing wavefront aberration analysis without Zernike polynomials
    D Robert Iskander
    School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove, QLD, Australia
    Ophthalmic Physiol Opt 29:292-9. 2009
    ..Clinicians may find this approach to wavefront analysis easier to interpret due to the clinical familiarity and intuitive appeal of refractive error maps...
  11. ncbi request reprint A refined bootstrap method for estimating the Zernike polynomial model order for corneal surfaces
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Rd, Kelvin Grove Q4059, Australia
    IEEE Trans Biomed Eng 51:2203-6. 2004
    ..On the other hand, for distorted corneas such as those encountered in keratoconus or in surgically altered cases, the estimated model was found to be up to three radial orders higher than for normal corneas...
  12. ncbi request reprint Objective refraction from monochromatic wavefront aberrations via Zernike power polynomials
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia
    Ophthalmic Physiol Opt 27:245-55. 2007
    ....
  13. ncbi request reprint Automatic pupillometry from digital images
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Kelvin Grove Q4059, Brisbane, Australia
    IEEE Trans Biomed Eng 51:1619-27. 2004
    ..We apply the developed algorithm to images obtained by a standard digital camera, and specialized ophthalmic instruments such as a wavefront sensor and a high-speed imaging system...
  14. ncbi request reprint Analyzing the dynamic wavefront aberrations in the human eye
    D Robert Iskander
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Kelvin Grove Q4059, Australia
    IEEE Trans Biomed Eng 51:1969-80. 2004
    ..The exposition of the techniques and their advantages over traditional techniques is illustrated for real dynamic eye wavefront aberration measurements...
  15. ncbi request reprint Automatic estimation of the corneal limbus in videokeratoscopy
    Mark R Morelande
    Centre for Eye Research, Queensland University of Technology, Kelvin Grove Q4059, Australia
    IEEE Trans Biomed Eng 49:1617-25. 2002
    ..Comparisons between the proposed algorithm, a manual computer-based technique and an algorithm which uses conventional edge-detection techniques demonstrate the accuracy of the proposed algorithm...
  16. ncbi request reprint Dynamics of ocular surface topography
    M Zhu
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Kelvin Grove, Australia
    Eye (Lond) 21:624-32. 2007
    ..To investigate fluctuations in the ocular surface, we used high-speed videokeratoscopy (50 Hz) to measure the dynamics of the ocular surface topography...
  17. ncbi request reprint The stability of corneal topography in the post-blink interval
    T Buehren
    Contact Lens and Visual Optics Laboratory, Center for Eye Research, School of Optometry, Queensland University of Technology Brisbane, Australia
    Cornea 20:826-33. 2001
    ..However, the upper and lower edges of 8-mm diameter maps show statistically significant variability, which appears to be related to the effects of eyelid pressure...
  18. ncbi request reprint Spectral characteristics of longitudinal corneal apex velocities and their relation to the cardiopulmonary system
    H T Kasprzak
    Faculty of Health, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia
    Eye (Lond) 21:1212-9. 2007
    ..To study the naturally occurring kinetic characteristics of corneal surface...
  19. doi request reprint Estimation of the depth of focus from wavefront measurements
    Fan Yi
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove, QLD 4059, Australia
    J Vis 10:3.1-9. 2010
    ..88, p < 0.001). The linear correlation can be used to estimate the threshold level for each individual subject, subsequently leading to a method for estimating individual's DOF from a single measurement of their wavefront aberrations...
  20. doi request reprint Diurnal variation of axial length, intraocular pressure, and anterior eye biometrics
    Scott A Read
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia
    Invest Ophthalmol Vis Sci 49:2911-8. 2008
    ..To investigate the diurnal variation in axial length and anterior eye biometrics, while simultaneously measuring intraocular pressure (IOP) with dynamic contour tonometry in human subjects...
  21. doi request reprint Tear film surface quality with soft contact lenses using dynamic-area high-speed videokeratoscopy
    David Alonso-Caneiro
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, QLD, Australia
    Eye Contact Lens 35:227-31. 2009
    ..To evaluate the performance of the dynamic-area high-speed videokeratoscopy technique in the assessment of tear film surface quality with and without the presence of soft contact lenses on eye...
  22. doi request reprint Corneal topography with Scheimpflug imaging and videokeratography: comparative study of normal eyes
    Scott A Read
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia
    J Cataract Refract Surg 35:1072-81. 2009
    ....
  23. doi request reprint Assessment of tear film surface quality using dynamic-area high-speed videokeratoscopy
    David Alonso-Caneiro
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Qld Q4059, Australia
    IEEE Trans Biomed Eng 56:1473-81. 2009
    ..Subsequently, the method proved to be able to not only discriminate between the bare eye and the lens on eye conditions but also to have the potential to discriminate between the two types of contact lenses...
  24. doi request reprint Estimating corneal surface topography in videokeratoscopy in the presence of strong signal interference
    David Alonso-Caneiro
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane QLD 4001, Australia
    IEEE Trans Biomed Eng 55:2381-7. 2008
    ..Additionally, it is an interference indication procedure that, in the future, could be used for the purpose of tear film quality estimation...
  25. ncbi request reprint Potential higher-order aberration cues for sphero-cylindrical refractive error development
    Tobias Buehren
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia
    Optom Vis Sci 84:163-74. 2007
    ....
  26. ncbi request reprint Ocular microfluctuations and videokeratoscopy
    Tobias Buehren
    School of Optometry, Contact Lens and Visual Optics Laboratory, Center for Eye Research, Queensland University of Technology, Brisbane, Australia
    Cornea 21:346-51. 2002
    ..We aimed to minimize the effect of ocular microfluctuations during videokeratoscopy to improve the qualitative and quantitative analysis of corneal topography...
  27. ncbi request reprint Corneal topography and accommodation
    Tobias Buehren
    Center for Eye Research, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia
    Cornea 22:311-6. 2003
    ..To investigate whether there are significant changes in corneal topography during accommodation in normal corneas and corneas that are pathologically thinner due to keratoconus...
  28. ncbi request reprint Retinal image quality, reading and myopia
    Michael J Collins
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Rd, Kelvin Grove, Brisbane, QLD 4059, Australia
    Vision Res 46:196-215. 2006
    ..The interaction between low and high order aberrations of the eye play a significant role in reducing the retinal image quality of myopic eyes compared with emmetropes...
  29. ncbi request reprint Combining central and peripheral videokeratoscope maps to investigate total corneal topography
    Ross J Franklin
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia
    Eye Contact Lens 32:27-32. 2006
    ..To extend the area of standard corneal topography maps, one central map is combined with six peripheral maps after correlating them in a custom written computer program...
  30. ncbi request reprint The contribution of accommodation and the ocular surface to the microfluctuations of wavefront aberrations of the eye
    Mingxia Zhu
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove 4059, Queensland, Australia
    Ophthalmic Physiol Opt 26:439-46. 2006
    ..This increase in defocus fluctuations (p < or = 0.001) occurred in both the low- and high-frequency regions of the power spectra...
  31. ncbi request reprint The morphology of the palpebral fissure in different directions of vertical gaze
    Scott A Read
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia
    Optom Vis Sci 83:715-22. 2006
    ..Palpebral fissure characteristics are clinically important in areas such as contact lens practice...
  32. ncbi request reprint Blinking patterns and corneal staining
    Michael J Collins
    Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Kelvin Grove, Queensland, Australia
    Eye Contact Lens 32:287-93. 2006
    ..To investigate the blinking patterns of healthy subjects and soft contact lens wearers and determine whether these blinking characteristics were associated with corneal fluorescein staining...
  33. doi request reprint Lateral shearing interferometry for analysis of tear film surface kinetics
    Dorota H Szczesna
    Faculty of Fundamental Problems of Technology, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia
    Optom Vis Sci 87:513-7. 2010
    ..To date, there have been no measuring techniques available that could clearly identify all phases of tear film surface kinetics in one interblink interval...
  34. ncbi request reprint Computer simulation of visual outcomes of wavefront-only corneal ablation
    Fan Yi
    School of Engineering, Griffith University, Gold Coast, Australia
    J Cataract Refract Surg 32:487-94. 2006
    ..To evaluate the effectiveness, predicted visual outcome, and limitations of a corneal ablation algorithm that uses wavefront aberration measurement alone without the need for corneal shape information...
  35. ncbi request reprint Modeling of corneal surfaces with radial polynomials
    D Robert Iskander
    School of Engineering, Griffith University, Gold Coast Mail Centre, Australia
    IEEE Trans Biomed Eng 49:320-8. 2002
    ..Examples of modeling corneal elevation are given for normal corneas and for abnormal corneas with significant distortion...