Now showing items 21-40 of 228

    • Corneal sensitivity after ocular surgery 

      Lum, Edward; Murphy, Paul J.; Corbett, Melanie (Wolters Kluwer, 2019-07-01)
      The cornea is densely innervated with free nerve endings to provide a high level of sensitivity to foreign bodies or noxious substances. They also provide trophic support to the tissues of the cornea and facilitate their ...
    • Interaction of Tear Inflammatory Markers with Contact Lens Materials 

      Mirzapour, Parisa (University of Waterloo, 2020-01-28)
      Biomaterials are natural or synthetic materials that come into contact with biological tissue. Contact lenses are the most commonly used biomaterials, being worn by an estimated 140 million people worldwide. While contact ...
    • The blood compatibility challenge. Part 3: Material associated activation of blood cascades and cells 

      Gorbet, Maud; Sperling, Claudia; Maitz, Manfred; Siedleck, Christopher A.; Werner, Carsten; Sefton, Michael V. (Elsevier, 2019-08)
      Following protein adsorption/activation which is the first step after the contact of material surfaces and whole blood (part 2), fibrinogen is converted to fibrin and platelets become activated and assembled in the form ...
    • Topical anaesthetic use prior to rigid gas permeable contact lens fitting 

      Gill, Felicity; Murphy, Paul J.; Purslow, Christine (Elsevier, 2017-07-11)
      Purpose To investigate effect of topical anaesthetic (TA) during gas permeable (GP) contact lens (CL) fitting on subjective and objective measures of patient anxiety. Methods 47 subjects (mean ± sd age = 26.9 ± 4.9 ...
    • Effect of ambient humidity on the Cochet-Bonnet aesthesiometer 

      Lum, Edward; Murphy, Paul J. (Springer Nature, 2018-06-19)
      Purpose: The Cochet–Bonnet (COBO) aesthesiometer is the current standard in corneal sensitivity assessment. This study investigates the influence of ambient room humidity levels on the stimulus force exerted by the ...
    • Ocular impression-taking - which material is best? 

      Turner, Jennifer; Purslow, Christine; Murphy, Paul J. (Wolters Kluwer, 2019-01)
      Objectives: To assess the efficacy and effect on clinical signs of a polyvinylsiloxane (Tresident; Shütz Dental Group GmbH, Germany) compared with an irreversible hydrocolloid (Orthoprint; Zhermack SpA, Badia Polesine, ...
    • Atomic force microscopy analysis of the effect of plasma treatment on gas permeable contact lens surface topography 

      Gill, Felicity; Purslow, Christine; Murphy, Paul J. (Elsevier, 2019-02-23)
      Purpose: Using atomic force microscopy (AFM) to investigate anterior surface topography (AST) in worn and unworn, plasma surface-treated (PST) and untreated (UT) gas permeable (GP) lenses, and influence of surface topography ...
    • Overnight Corneal Swelling and Deswelling with Silicone Hydrogel Lenses 

      Moezzi, Amir Mahmoud (University of Waterloo, 2019-12-13)
      Purpose: To compare central corneal swelling (CS) after eight hours of sleep in eyes wearing 12 different silicone hydrogel (SiHy) contact lenses (CLs) and to model between-subject variability in CS and deswelling. Methods: ...
    • Immobilization of Gold Nanoparticles for Colourimetric and Ratiometric Refractive Index Sensing 

      Pollit, Lori (University of Waterloo, 2019-12-12)
      The development of refractive index sensors is an expanding field of research, with applications in fields including medical diagnostics, food safety and public health. Nanotechnology has become widely implemented in various ...
    • Prevalence of Convergence Insufficiency-Type Symptomatology in Parkinson’s Disease 

      Law, Caroline; Chriqui, Estefania; Kergoat, Marie-Jeanne; Leclerc, Bernard-Simon; Panisset, Michel; Irving, Elizabeth L.; Postuma, Ronald B.; Chouinard, Sylvain; Kergoat, Hélène (Cambridge University Press, 2017-09)
      Background: Individuals with Parkinson’s disease (PD) often present with visual symptoms (e.g., difficulty in reading, double vision) that can also be found in convergence insufficiency (CI). Our objective was to estimate ...
    • Motion Processing of Reverse Phi 

      Kuppuswamy Parthasarathy, Mohana (University of Waterloo, 2019-11-18)
      Introduction: When the contrast of the successive images is reversed for a target in an apparent motion stimulus, the perceived direction is reversed, i.e., opposite of phi motion, which is an integration of the sequential ...
    • Protocol development for reliable isolation of tear-film neutrophils and in vitro functionality testing 

      Jin, Yutong (University of Waterloo, 2019-09-19)
      During prolonged eye closure, such as during sleep, leukocytes are recruited to the ocular surface, with polymorphonuclear neutrophils (PMNs) representing the largest population. PMNs are essential inflammatory cells ...
    • Effects of Temperature on the Proliferation of Human and Fish Lens Epithelial Cells 

      Li, Ziqing (University of Waterloo, 2019-08-29)
      Crystallins are proteins that confer refractive properties to the crystalline lens. All vertebrate lenses contain α- and β-crystallins, and often a third major crystallin. Crystallins can have additional non-refractive ...
    • Estimation of Heading direction Using Optic Flow 

      Eshnina, Najwa (University of Waterloo, 2019-08-26)
      Background The purpose of this study was to investigate the effect of the reduction of the uniocular light luminance as well as the effect of unequal retinal image sizes by using uniocular size lenses, on the heading ...
    • Is blur sensitivity altered in children with progressive myopia? 

      Labhishetty, Vivek; Chakraborty, Arijit; Bobier, William (Elsevier, 2019-01)
      School aged children with progressive myopia show large accommodative lags to blur only cue which is suggestive of a large depth of focus (DOF). While DOF measures are lacking in this age group, their blur detection and ...
    • Psychophysical Studies Of Motion Perception In Autism Spectrum Disorders 

      Bakroon, Asmaa (University of Waterloo, 2019-05-23)
      Introduction Studies have shown considerable evidence of visual dysfunction in Autism Spectrum Disorders (ASD). Motion perception research in ASD reports a superior performance in processing motion information of fine ...
    • Comparative Clinical Performance of Scleral Lenses with Varying Limbal Clearance in a Keratoconic Population 

      Yeung, Debby (University of Waterloo, 2019-05-10)
      PURPOSE The purpose of this study is to investigate the impact varying the limbal clearance (LC) has on the clinical performance of scleral lenses and the levels of inflammatory mediators in the tear film of keratoconic ...
    • Assessment of ocular aberrations at scaled pupil size and reduced Shack-Hartmann spot number 

      Ommani, Abbas (University of Waterloo, 2019-05-07)
      Wavefront aberrations describe the optical imperfections of the eye by measuring the complete refractive elements of the eye. However, the reliability of ocular aberration is uncertain under some challenges and issues. ...
    • Aspects of Corneal Fluorescein Staining 

      Woods, Jill (University of Waterloo, 2019-04-25)
      PURPOSE Evaluating the cornea for epithelial fluorescein staining is a key element of the ocular examination of contact lens wearers and people with dry eye disease. It has long been viewed as a method of visualizing a ...
    • Visual Functions in Post-Concussion Syndrome 

      Alamri, Suhailah (University of Waterloo, 2018-10-24)
      Purpose: Post-concussion syndrome (PCS) is a is a complex neurological disorder in which various concussion symptoms can last for weeks, months, or even years after sustaining the concussion. The PCS population has been ...

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