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2 results on '"Jeffrey C. W. Chan"'

1. Association between endoscopic cyclophotocoagulation and vitreous prolapse in trabeculectomy: a case report

Author

Vikki W. K. Ng, Jeffrey C. W. Chan, and Kenneth K. W. Li

Subjects
Endoscopic cyclophotocoagulation, Zonular damage, Trabeculectomy, Vitreous prolapse, Case report, Ophthalmology, RE1-994
Abstract

Abstract Background To propose that possible alteration or damage to the ciliary zonules during uncomplicated endoscopic cyclophotocoagulation (ECP) can cause complications in subsequent filtration surgery. Case presentation We present two cases with uncomplicated primary combined phacoemulsification and ECP that underwent subsequent trabeculectomy. Both cases were complicated with vitreous prolapse during the trabeculectomy procedure. We review the anatomy of the ciliary zonules and their spatial relationship with the ciliary processes targeted during ECP and propose an association between ECP, zonular damage and complications in subsequent trabeculectomy such as vitreous prolapse. Conclusions Damage to ciliary zonules during ECP may not manifest until subsequent glaucoma filtration surgery. In patients who received prior ECP, we may consider taking preventative measures to avoid associated complications such as vitreous prolapse. Patients with known risk factors for weak zonules may consider choosing alternative intraocular pressure-lowering means.

Published
2022
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2. Measurement of intraocular pressure with pressure phosphene tonometry in children

Author

Dennis S.C. Lam, Jeffrey C W Chan, Nathan Congdon, Eva Y. Y. Cheung, Dorothy S. P. Fan, and Thomas Y. H. Chiu

Subjects
Male, Intraocular pressure, medicine.medical_specialty, genetic structures, Adolescent, Phosphenes, Sensitivity and Specificity, Mean difference, Tonometry, Ocular, Predictive Value of Tests, Ophthalmology, Medicine, Humans, Prospective Studies, Child, Intraocular Pressure, Alternative methods, business.industry, Reproducibility of Results, General Medicine, eye diseases, Phosphene, Patient Satisfaction, Child, Preschool, Pediatrics, Perinatology and Child Health, Female, sense organs, business
Abstract

Purpose: To study the accuracy and acceptability of intraocular pressure (IOP) measurement by the pressure phosphene tonometer, non-contact tonometer, and Goldmann tonometer in children. Methods: Fifty children (5 to 14 years old) participated in this prospective comparative study. IOP was measured with the pressure phosphene tonometer, non-contact tonometer, and Goldmann tonometer by three different examiners who were masked to the results. The children were also asked to grade the degree of discomfort from 0 to 5 (0 = no discomfort; 5 = most discomfort). Results: The mean IOPs measured by the Goldmann tonometer, pressure phosphene tonometer, and non-contact tonometer were 15.9 mm Hg (standard deviation [SD]: = 5.5 mm Hg; range: 10 to 36 mm Hg), 16.0 mm Hg (SD: 2.9 mm Hg; range: 12 to 25 mm Hg), and 15.7 mm Hg (SD = 5.1 mm Hg; range: 8 to 32 mm Hg), respectively ( P = .722). The mean difference between pressure phosphene tonometer and Goldmann tonometer readings was 2.9 mm Hg and that between non-contact tonometer and Goldmann tonometer readings was 2.1 mm Hg. The 95% confidence interval of the mean difference between pressure phosphene tonometer and Goldmann tonometer readings was −1.07 and 1.19, and that between non-contact tonometer and Goldmann tonometer readings was −1.07 and 0.53. The mean discomfort ratings for the pressure phosphene tonometer, non-contact tonometer, and Goldmann tonometer were 0.6, 2.0, and 2.3, respectively ( P < .001). Conclusion: Although the pressure phosphene tonometer was less accurate than the non-contact tonometer compared with Goldmann tonometer, it gave a reasonably close estimate and had a high specificity of raised IOP. In addition, measurement by the pressure phosphene tonometer is most acceptable to children. The pressure phosphene tonometer can be considered as an alternative method of IOP measurement in children.

Published
2009

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