Research Topics
| D R IskanderSummaryAffiliation: Queensland University of Technology Country: Australia Publications
| Collaborators
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Detail Information
Publications
Optimal modeling of corneal surfaces with Zernike polynomialsD 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...- The skew ray ambiguity in the analysis of videokeratoscopic dataD 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... - Extrapolation of central corneal topography into the peripheryD 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... - Dynamics in longitudinal eye movements and corneal shapeD 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... - A parametric approach to measuring limbus corneae from digital imagesD 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... - Computational aspects of the visual Strehl ratioD 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... 
Modeling videokeratoscopic height data with spherical harmonicsD 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...- Evaluating tear film stability in the human eye with high-speed videokeratoscopyD 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.... - Applications of high-speed videokeratoscopyD 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... - The statistics of refractive error maps: managing wavefront aberration analysis without Zernike polynomialsD 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... - A refined bootstrap method for estimating the Zernike polynomial model order for corneal surfacesD 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... - Objective refraction from monochromatic wavefront aberrations via Zernike power polynomialsD 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.... - Automatic pupillometry from digital imagesD 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... - Analyzing the dynamic wavefront aberrations in the human eyeD 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... - Automatic estimation of the corneal limbus in videokeratoscopyMark 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... - Dynamics of ocular surface topographyM 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... - The stability of corneal topography in the post-blink intervalT 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... - Spectral characteristics of longitudinal corneal apex velocities and their relation to the cardiopulmonary systemH 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... - Estimation of the depth of focus from wavefront measurementsFan 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... - Diurnal variation of axial length, intraocular pressure, and anterior eye biometricsScott 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... - Tear film surface quality with soft contact lenses using dynamic-area high-speed videokeratoscopyDavid 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... - Corneal topography with Scheimpflug imaging and videokeratography: comparative study of normal eyesScott 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.... - Assessment of tear film surface quality using dynamic-area high-speed videokeratoscopyDavid 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... - Estimating corneal surface topography in videokeratoscopy in the presence of strong signal interferenceDavid 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... - Potential higher-order aberration cues for sphero-cylindrical refractive error developmentTobias Buehren
Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia
Optom Vis Sci 84:163-74. 2007.... - Ocular microfluctuations and videokeratoscopyTobias 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... - Corneal topography and accommodationTobias 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... - Retinal image quality, reading and myopiaMichael 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... - Combining central and peripheral videokeratoscope maps to investigate total corneal topographyRoss 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... - The contribution of accommodation and the ocular surface to the microfluctuations of wavefront aberrations of the eyeMingxia 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... - The morphology of the palpebral fissure in different directions of vertical gazeScott 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... - Blinking patterns and corneal stainingMichael 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... - Lateral shearing interferometry for analysis of tear film surface kineticsDorota 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... - Computer simulation of visual outcomes of wavefront-only corneal ablationFan Yi
School of Engineering, Griffith University, Gold Coast, Australia
J Cataract Refract Surg 32:487-94. 2006..The presented methodology may be used as a screening tool to predict patients' visual outcomes before the surgery... - Modeling of corneal surfaces with radial polynomialsD 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...