Abstracts of Annual Scientific Meeting of the Hong Kong Ophthalmological Society 2005 Clinical characteristics of intermittent exotropia in Hong Kong

s of Annual Scientific Meeting of the Hong Kong Ophthalmological Society 2005 Clinical characteristics of intermittent exotropia in Hong Kong Flora HS Lau, C Yu, Dorothy Fan, Yip, Dennis SC Lam Hong Kong Eye Hospital Purpose: To describe the clinical characteristics of patients with intermittent exotropia at Hong Kong Eye Hospital. Methods: Prospective case series of 129 patients with diagnosis of intermittent exotropia from year 2000 to 2001, with a mean follow up of 3 years. Results: Majority of the patients (65.1%) presented with basic type of exotropia, 17.8 % with the near type and the remaining 17.1% with the distance type. 44.2% of patients presented with V-pattern exotropia. Only 0.8 % of the patients presented with A-pattern exotropia. Conclusion: V pattern exotropia is more common in Hong Kong when compared with other reported data. A New Extraocular Application for Trypan Blue and Review of the Ocular Uses of Trypan Blue Leanne M Cheung, Geoffrey A Wilcsek, Ian C Francis, Minas T Coroneo Department of Ophthalmology, Prince of Wales Hospital and the University of New South Wales, Randwick, Sydney, NSW,Australia Enucleation surgery can be complicated by a variety of adverse outcomes including conjunctival inclusion cysts. To assist in the delineation between the conjunctiva and the Tenon capsule during enucleation surgery, we used a technique of applying trypan blue vital stain resulting in staining of the Tenon capsule without staining the conjunctiva. The ability to visualise the Tenon capsule separate to conjunctiva greatly assisted in the closure of these anatomically distinct layers. This may reduce the possibility of post surgical conjunctival inclusion cysts. To our knowledge, this is the first extraocular application of trypan blue in ophthalmology. A review of other ocular uses of trypan blue including staining of the anterior lens capsule in cataract surgery, and our preferred method for application of trypan blue in this setting, is included. Endoscopic dacryocystorhinostomy with mitomycin C and intranasal triamcinolone Hunter KL Yuen, Alex CW Wong, KC Auyeung Hong Kong Eye Hospital, DOVS, CUHK Pharmacological modulation of wound healing is commonly practised in ophthalmology. Corticosteroid reduces inflammation whereas mitomycin C inhibits fibroblasts and scar formation. Combined usage of these two agents may be useful in improving the success rate of endoscopic dacryocystorhinostomy (EDCR). The current study reports the result of EDCR using the nasal mucosa preserving technique with intraoperative mitomycin-c and intranasal application of triamcinolone through a piece of gelfoam. Success was defined anatomically by the presence of fluorescent dye in the nasal cavity. A total number of 30 cases were performed and the mean follow up duration was more than 12 months. The overall success rate was 96.7% (29/30). A video presentation of the surgical technique will be presented as well. Pars Plana Vitrectomy and Perfluoropropane (C3F8) Tamponade for Macular Hole Retinal Detachment a Prognostic Factor Analysis 1,2Robert F Lam, 1,2Wico WK Lai, 1,2Benson TO Cheung, 1,2Can YF Yuen, 1,2TH Wong, 1,2Mahesh P Shanmugam, 1,2Dennis SC Lam 1Department of Ophthalmology & Visual Sciences, The Chinese University of Hong Kong 2Vitreoretinal service, Hong Kong Eye Hospital Purpose: To determine the prognostic factors associated with anatomical success in the treatment of macular hole retinal detachment (RD) by pars plana vitrectomy (PPV) and perfluoropropane (C3F8) tamponade. Methods: Retrospective analysis of medical records of a consecutive series of 60 cases of macular hole RDs treated by PPV and C3F8 tamponade, with or without concomitant internal limiting membrane (ILM) r e m o v a l , e n d o l a s e r p h o t o c o a g u l a t i o n a n d / o r phacoemulsification. Results: The mean post-operative follow up was 26.9 16.5 (range 6 60) months. Regression analysis showed eyes with shorter axial lengths (odds ratio [OR] = 7.79, 95% CI = 1.68 36.22, P = 0.009), eyes with concomitant ILM removal (OR = 1.59, 95% = 1.14 2.38, P = 0.013) and duration of macular hole RD (OR = 0.81, 95% = 0.67 0.98, P = 0.033) were associated with anatomical success. Conclusion: Alternative surgical techniques may have the potential to improve the anatomical success rate in patients with poor prognostic factors. Combined photodynamic therapy and intravitreal triamcinolone injection for the treatment of subfoveal choroidal neovascularisation in agerelated macular degeneration: A comparative study 1Timothy YY Lai, 2Wai-Man Chan, 1Amy L Wong, 2David TL Liu, 2Dennis SC Lam 1Hong Kong Eye Hospital 2Department of Ophthalmology & Visual Sciences, The Chinese University of Hong Kong 3Prince of Wales Hospital Aim: To evaluate the outcomes of combined intravitreal triamcinolone (IVTA) and photodynamic therapy (PDT) with verteporfin in the treatment of subfoveal choroidal neovascularisation (CNV) due to age-related macular + Abstracts 20 VOL.11 NO.3 MARCH 2006