Kunyong Xu

Queen's University, Kingston, Ontario, Canada

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Publications (10)12.15 Total impact

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    ABSTRACT: Corneal collagen cross-linking (CXL) has been shown to slow down or stop the progression of keratoconus. In addition, CXL has been applied in cases of corneal ectasia. Recent reports of the use of CXL in cases of infectious keratitis have generated further interest in this treatment modality. This review discusses the principle, clinical uses, and complications associated with CXL.
    09/2015; DOI:10.1097/APO.0000000000000145
  • Kunyong Xu · Hamish D McKee · Vishal Jhanji ·
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    ABSTRACT: Phototherapeutic keratectomy (PTK) was approved by the US FDA in 1995 for the treatment of anterior corneal disorders. The surgery entails ablation of corneal tissue using excimer laser in order to treat visual pathologies limited to the anterior third of the cornea. Although considered to be an interim procedure for certain indications, such as bullous keratopathy, PTK is a viable option for recurrent corneal erosion syndrome and postsurgical scarring. This review will discuss the indications, outcomes and complications of PTK in clinical practice.
    Expert Review of Ophthalmology 01/2014; 9(1). DOI:10.1586/17469899.2014.870474
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    ABSTRACT: To evaluate the impact of surgeon practice profile on clinic-based glaucoma care. Population-based study of glaucoma care patterns in Ontario, Canada from 2000 to 2010. Using comprehensive physician services data from the Ontario Health Insurance Plan database, ophthalmologists were divided into five surgical practice subgroups. The role of each subgroup in the provision of glaucoma care was evaluated. Consultations and office visits were used to assess non-surgical care, while laser trabeculoplasty procedures were used to assess clinic-based procedural care. Between 2000 and 2010, the population rate of glaucoma consultations and follow up visits provided by ophthalmologists who do not perform incisional glaucoma surgery increased at average annual rates of 1.6% (p<0.0002) and 3.3% (p<0.0001), respectively. In contrast, no significant growth in the rate of glaucoma consultations or follow up visits provided by glaucoma surgeons was observed (0.8%/year [p=0.2] for consultations; 0.2%/year [p=0.6] for follow up visits). Between 2000 and 2010, the rate of laser trabeculoplasty procedures provided by ophthalmologists who do not perform incisional glaucoma surgery increased 19.3% annually (p<0.0001), while growth among glaucoma surgeons was more modest (annual growth of 9.2% [p=0.0002]). While subspecialization is a growing reality in most areas of medicine, we found that the provision of clinic-based glaucoma care remains dependent on ophthalmologists that do not perform incisional glaucoma surgery. With increasing focus on integrated care, these findings will have important implications for residency education programs and their accrediting bodies and will inform decisions of health care policy makers, hospitals and academic departments.
    American Journal of Ophthalmology 12/2013; 157(3). DOI:10.1016/j.ajo.2013.11.019 · 3.87 Impact Factor
  • Kunyong Xu · Ka Wai Kam · Alvin L. Young · Vishal Jhanji ·
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    ABSTRACT: Recurrent corneal erosion syndrome is characterized by repeated episodes of sudden onset of pain usually upon awakening or at night because of detachment of the weakly adhered corneal epithelium. Most of the cases can be attributed to trauma or superficial corneal dystrophies. Because of the variable clinical course, the disease causes much frustration to patients and to the ophthalmologists. Treatment options range from conservative management with lubricants, bandage contact lenses, and matrix metalloproteinase inhibitors to surgical interventions such as epithelial debridement, anterior stromal puncture, alcohol delamination, and excimer laser therapy.
    11/2012; 1(6):349-354. DOI:10.1097/APO.0b013e31827347ae
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    Kunyong Xu · Graham E Trope · Ray Buncic · Ya-Ping Jin ·
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    ABSTRACT: To examine whether different government-insured eye care coverage policies affect adolescents' access to eye care providers (ophthalmologists and optometrists) in Canada. Cross-sectional survey. 11 015 Canadian adolescents aged 12 to 17 participated in the Canadian Community Health Survey (CCHS) 2007-2008. Self-reported use of eye care providers, was compared between adolescents with and without government-insured routine eye examinations. The association between the utilization and the government coverage was evaluated by using prevalence ratios (PR) and 95% confidence intervals (CI). Across Canada, 45.6% of adolescents used eye care providers over a 12-month period. The utilization rate was highest (46.4%) in provinces with insured routine eye examinations, lower (35.9%) in provinces without insured routine eye examinations, and lowest (27.1%) in the 3 territories. Significantly lower utilization rates were also found in males (10% less likely than females); in those without dwelling ownership (19% less likely than those who owned); in those who read fewer than 3 hours weekly (13% less likely than in those who read 3 or more hours per week); and in nondiabetics. After adjusting for the confounding effects of these factors, we found that adolescents living in provinces with uninsured routine eye examinations were 24% less likely to utilize eye care services (PR = 0.76; 95% CI 0.67-0.85); whereas those in the 3 territories were nearly 40% less likely to use eye care providers (PR = 0.63; 95% CI 0.48-0.83) compared to adolescents in provinces with insured routine eye examinations. Lack of eye care insurance for routine eye examinations has a negative impact on adolescents' access to eye care providers in Canada.
    Canadian Journal of Ophthalmology 06/2012; 47(3):211-6. DOI:10.1016/j.jcjo.2012.03.041 · 1.33 Impact Factor
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    Kunyong Xu ·

    Canadian family physician Medecin de famille canadien 06/2012; 58(6):e357. · 1.34 Impact Factor
  • Kunyong Xu · Hamish D McKee · Vishal Jhanji ·
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    ABSTRACT: Background: The aim was to retrospectively analyse the reasons for not performing laser-assisted in situ keratomileusis (LASIK) surgery among refractive surgery candidates at a university eye clinic. Methods: Case records of patients who presented to a university eye clinic between June 2005 and June 2010 for consideration for LASIK surgery were examined. Cases that did not undergo LASIK were selected for analysis. Reasons for not performing surgery in these cases were analysed. Results: In total, 552 patients requested LASIK between July 2005 and June 2010 and 377 (68.3 per cent) of them received refractive surgery. Among 175 (31.7 per cent) patients who did not get LASIK, 62 (35.4 per cent) were male and 113 (64.6 per cent) were female, with a mean age at presentation of 36.4 ± 9.3 years (range: 19 to 78 years). The most common reasons for not offering LASIK were low corneal thickness (28.6 per cent), high myopia (15.4 per cent), large pupil (8.0 per cent) and keratoconus (7.4 per cent). Overall, 39 patients (22.3 per cent) changed their mind after their initial consultations with surgeons. The prevalence of rejection of LASIK decreased from 44.1 per cent between July 2005 and June 2006 to 3.5 per cent between July 2009 and June 2010. Conclusions: Reasons for not performing refractive surgery are quite diverse. Inadequate corneal thickness and change of mind after initial consultation were the most common reasons in the present study. There was a marked change in magnitude and trend of reasons for not performing LASIK over the study period. Further studies from settings other than university hospitals would be beneficial to compare the trend in patient selection.
    Clinical and Experimental Optometry 05/2012; 96(1). DOI:10.1111/j.1444-0938.2012.00730.x · 1.34 Impact Factor
  • Kunyong Xu · Vishal Jhanji ·

    Canadian family physician Medecin de famille canadien 05/2012; 58(5):537, 540, 542. · 1.34 Impact Factor
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    ABSTRACT: To understand the current landscape and the evolution of predeparture training (PDT) in Canadian medical education. The authors surveyed one faculty and one student global health leader at each of Canada's 17 medical schools in February 2008 and May 2010 to assess the delivery of and requirements for PDT at each institution. The authors then used descriptive statistics to compare responses across schools and years. In 2008, one faculty and one student representative from each of the 17 Canadian medical schools completed the survey; in 2010, 17 faculty and 16 student representatives responded. The number of medical schools offering PDT grew substantially from 2008 to 2010 (11/17 [65%] versus 16/17 [94%]). Three of the five new programs in 2010 were student run. The number of schools with mandatory PDT nearly doubled (6/17 [35%] versus 11/17 [65%]). However, institutional funding remained scarce, as 10 of 16 programs had budgets of less than $500 in 2010. PDT content, frequency, and format varied from school to school. Medical students have been responsible for organizing the majority of new PDT. To ensure quality and sustainability, however, faculty must play a more central role in the planning and implementation of such training programs. Medical schools must continue to reevaluate how best to maximize global health electives for trainees and the communities in which they study. PDT offers one avenue for schools to ensure that students are safe and socially accountable during their time abroad.
    Academic medicine: journal of the Association of American Medical Colleges 12/2011; 87(2):206-9. DOI:10.1097/ACM.0b013e31823e23d4 · 2.93 Impact Factor
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    Kunyong Xu · Vishal Jhanji ·
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    ABSTRACT: Correction of refractive errors can be achieved with spectacles, contact lenses, and refractive surgery. The past decade has seen a surge in the availability of alternatives for patients and surgeons in terms of both surgical and nonsurgical options for the management of refractive errors. Newer generation contact lenses provide enhanced safety and better handling, whereas modern-day refractive surgery presents a plethora of choices based on the clinical characteristics and requirements of patients. We have moved from an era of "one size fits all" to a purely customized way of treating patients with refractive errors. This review presents the background, advantages, and disadvantages of the two most commonly used options for correction of ametropia, ie, contact lenses and refractive surgery.
    Clinical Optometry 01/2011; 3:63-72. DOI:10.2147/OPTO.S16200

Publication Stats

35 Citations
12.15 Total Impact Points


  • 2012-2014
    • Queen's University
      • Department of Ophthalmology
      Kingston, Ontario, Canada
    • Hamilton University
      Hamilton, Ohio, United States
  • 2011-2012
    • McMaster University
      • Michael G. DeGroote School of Medicine
      Hamilton, Ontario, Canada