Applications of high‐speed videokeratoscopy

High‐speed videokeratoscopy is an emerging technology that has the potential to provide new information on dynamic changes of corneal topography and tear film behaviour. We have developed a high‐speed videokeratoscope that has the ability to acquire data at the rate of 50 Hz. Two major applications of the technology are considered in this paper. First, the analysis of tear film stability in the inter‐blink interval is evaluated and techniques for estimating the tear film build‐up and break‐up times are considered. The second application involves the study of the dynamic response of the corneal anterior surface to mechanical forces exerted by the eyelids during horizontal eye movements in downward gaze. The limitations and potential opportunities for the use of this new technology are discussed.

[1]  S. Barbero,et al.  Optical response to LASIK surgery for myopia from total and corneal aberration measurements. , 2001, Investigative ophthalmology & visual science.

[2]  J M Miller,et al.  Comparison of three videokeratoscopes in measurement of toric test surfaces. , 1996, Journal of refractive surgery.

[3]  Leo G. Carney,et al.  Near work induced wavefront aberrations in myopia , 2005, Vision Research.

[4]  Xiaodong Zheng,et al.  Evaluation of the tear film stability after laser in situ keratomileusis using the tear film stability analysis system. , 2004, American journal of ophthalmology.

[5]  L. Carney,et al.  Corneal Aberrations and Reading , 2003, Optometry and vision science : official publication of the American Academy of Optometry.

[6]  S D Klyce,et al.  Quantitative descriptors of corneal shape derived from computer-assisted analysis of photokeratographs. , 1989, Refractive & corneal surgery.

[7]  M. Collins,et al.  Recovery of Corneal Topography and Vision Following Opaque-Tinted Contact Lens Wear , 2004, Eye & contact lens.

[8]  D. R. Iskander,et al.  Combining Central and Peripheral Videokeratoscope Maps to Investigate Total Corneal Topography , 2006, Eye & contact lens.

[9]  P. Artal,et al.  Corneal wave aberration from videokeratography: accuracy and limitations of the procedure. , 2000, Journal of the Optical Society of America. A, Optics, image science, and vision.

[10]  J. Schwiegerling,et al.  Keratoconus Detection Based on Videokeratoscopic Height Data , 1996, Optometry and vision science : official publication of the American Academy of Optometry.

[11]  Xiaodong Zheng,et al.  Tear Film Stability Analysis System: Introducing a New Application for Videokeratography , 2004, Cornea.

[12]  W Tang,et al.  The Accuracy and Precision Performance of Four Videokeratoscopes in Measuring Test Surfaces , 2000, Optometry and vision science : official publication of the American Academy of Optometry.

[13]  R. Schultze,et al.  Accuracy of corneal elevation with four corneal topography systems. , 1998, Journal of refractive surgery.

[14]  E. Herderick,et al.  Quantitative Descriptors of Corneal Topography That Influence Soft Toric Contact Lens Fitting , 2002, Cornea.

[15]  Mark R. Morelande,et al.  Automatic estimation of the corneal limbus in videokeratoscopy , 2002, IEEE Transactions on Biomedical Engineering.

[16]  D. R. Iskander,et al.  Ocular Microfluctuations and Videokeratoscopy , 2002, Cornea.

[17]  J. M. Miller,et al.  Representation of videokeratoscopic height data with Zernike polynomials. , 1995, Journal of the Optical Society of America. A, Optics, image science, and vision.

[18]  Norihiko Yokoi,et al.  [Tear dynamics and dry eye]. , 2004, Nippon Ganka Gakkai zasshi.

[19]  J O Hjortdal,et al.  Regional elastic performance of the human cornea. , 1996, Journal of biomechanics.

[20]  L S Mengher,et al.  A non-invasive instrument for clinical assessment of the pre-corneal tear film stability. , 1985, Current eye research.

[21]  S K Rao,et al.  Pupillometry using videokeratography in eyes with dark brown irides. , 2000, Journal of cataract and refractive surgery.

[22]  M. Collins,et al.  Regression of Lid-Induced Corneal Topography Changes After Reading , 2005, Optometry and vision science : official publication of the American Academy of Optometry.

[23]  J. Németh,et al.  Corneal topography changes after a 15 second pause in blinking , 2001, Journal of cataract and refractive surgery.

[24]  G. Stiny.  Shape , 1999 .

[25]  D. R. Iskander,et al.  Evaluating tear film stability in the human eye with high-speed videokeratoscopy , 2005, IEEE Transactions on Biomedical Engineering.

[26]  D. Lieberman,et al.  The Lids Influence on Corneal Shape , 2000, Cornea.

[27]  Peter Meer,et al.  Unbiased Estimation of Ellipses by Bootstrapping , 1996, IEEE Trans. Pattern Anal. Mach. Intell..

[28]  T. Simpson,et al.  Contact Lens-Induced Corneal Swelling and Surface Changes Measured with the Orbscan II Corneal Topographer , 2004, Optometry and vision science : official publication of the American Academy of Optometry.

[29]  Paul L. Rosin.  A note on the least squares fitting of ellipses , 1993, Pattern Recognit. Lett..

[30]  W. Charman,et al.  Postblink changes in total and corneal ocular aberrations. , 2004, Ophthalmology.

[31]  Xiaodong Zheng,et al.  A new method for tear film stability analysis using videokeratography. , 2003, American journal of ophthalmology.

[32]  Péter Gáspár,et al.  High-speed videotopographic measurement of tear film build-up time. , 2002, Investigative ophthalmology & visual science.

[33]  D. R. Iskander,et al.  The Stability of Corneal Topography in the Post-Blink Interval , 2001, Cornea.

[34]  Yukihiro Matsumoto,et al.  A new noninvasive tear stability analysis system for the assessment of dry eyes. , 2004, Investigative ophthalmology & visual science.

[35]  Robert Montés-Micó,et al.  Temporal changes in optical quality of air-tear film interface at anterior cornea after blink. , 2004, Investigative ophthalmology & visual science.

[36]  Theo Seiler,et al.  Correlation between corneal and total wavefront aberrations in myopic eyes. , 2003, Journal of refractive surgery.

[37]  Mark R. Morelande,et al.  Analyzing the dynamic wavefront aberrations in the human eye , 2004, IEEE Transactions on Biomedical Engineering.

[38]  Robert B. Mandell,et al.  A guide to videokeratography , 1996 .

[39]  M. Yap,et al.  Influence of Lid Position on Astigmatism , 1986, American journal of optometry and physiological optics.