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Nguyen P.H.,University of Sydney | Catt C.,University of Sydney | Nguyen T.X.,Vietnam National Institute of Ophthalmology | Pham V.T.,Hanoi Medical University
Clinical Ophthalmology | Year: 2015

Background: The purpose of this study was to evaluate the refraction of eyes treated with diode laser photocoagulation for prethreshold retinopathy of prematurity (ROP) at a mean of 5 years after treatment. Materials and methods: Fifty infants with prethreshold ROP treated with diode laser at Hanoi Childrens’ Hospital during the period 2008 to 2009 were reviewed. Refractive error was identified by cycloplegic refraction with Cyclogyl 1%. Myopia was divided into two categories based on magnitude: high myopia (more than -5.00 D) and low myopia (between 0 and -5.00 D). Hypermetropia was subdivided into low hypermetropia (between 0 and +5.00 D) and high hypermetropia (greater than +5.00 D). Astigmatism was classified as high if.2.00 D. Eyes with media opacification that interferes with retinoscopy were excluded. The refractive outcome was correlated with birth weight and gestational age. The anatomical and visual out- comes were recorded. Results: One hundred eyes from 50 infants were included in the study. The mean birth weight was 1,426.4 g and the mean gestational age was 29.88 weeks. After 5 years of follow-up, the average spherical equivalent for 100 eyes was -2.87 D. On cycloplegic retinoscopy, high myopia (more than -5.00 D) was seen in 32% of eyes. Twenty (20%) eyes had nonsignificant hypermetropia, and high hypermetropia (more +5.00 D) was seen in only one eye (1%). The prevalence of astigmatism and high astigmatism (more than -2.00 D) was 79% and 49%, respectively. Three infants (6%) had esotropia and two infants (4%) had exotropia. None of the infants had nystagmus. Conclusion: The majority of patients who underwent diode laser therapy for prethreshold ROP had favourable anatomical and visual outcomes. High refractive error is common and may be the cause of visual impairment. © 2015 Nguyen et al. Source


Ngan N.D.,Hanoi Medical University | Chau H.T.,Vietnam National Institute of Ophthalmology
Clinical and Experimental Ophthalmology | Year: 2011

Background: To describe the outcome of surgery using amniotic membrane transplantation for Mooren's ulcer. Design: A prospective interventional case series from the Vietnam National Institute of Ophthalmology. Participants: Eighteen eyes of 14 patients with Mooren's ulcer. Seven eyes had recurrent episodes of ulceration, and 11 were not responsive to medical therapy or conjunctival resection. Methods: All eyes were treated with amniotic membrane grafts for Mooren's ulcer (10 eyes with multilayer grafts; 8 with a single layer graft). Five eyes with a 360° peripheral ulcer were treated with an overlay amniotic membrane graft, and 13 eyes were treated with a freehand graft tailored to fit the localized defect. Main Outcome Measures: Time to epithelial healing. Visual acuity outcome. Result: Sixteen of 18 eyes were treated by a single surgery with amniotic membrane with rapid healing of the epithelial defect (mean time to complete epithelialization 12.4days). Two eyes required a second amniotic membrane graft: one eye required regrafting following a subgraft haemorrhage and another eye required regrafting for a persistent epithelial defect. Vision was stabilized in all eyes with 10 of 18 eyes obtaining vision of 6/12 or better. Conclusion: Amniotic membrane transplantation may be a useful treatment for selected patients with Mooren's ulcer especially where systemic immunosuppressive drugs are unavailable. © 2011 The Authors. Clinical and Experimental Ophthalmology © 2011 Royal Australian and New Zealand College of Ophthalmologists. Source


Do T.,Vietnam National Institute of Ophthalmology | Hon D.N.,Vietnam National Institute of Ophthalmology | Aung T.,Singapore National Eye Center | Hien N.D.T.N.,Vietnam National Institute of Ophthalmology | Cowan C.L.,Georgetown University
Clinical Ophthalmology | Year: 2014

Background/aims: To compare treatment outcomes with and without silicone oil tamponade in patients undergoing pars plana vitrectomy (PPV) for severe endogenous bacterial endophthalmitis (BEE).Methods: One hundred and eight consecutive patients with severe BEE (defined by the absence of pupil red reflex at presentation and/or dense vitreous opacity on ultrasound and no improvement after 24–36 hours of medical treatment) were randomly assigned to two treatment groups: Group 1, standard PPV with intravitreal antibiotics; and Group 2, PPV with intravitreal antibiotics and silicone tamponade. Overall success was defined as: a visual acuity ≥ count fingers at 1 meter, with an attached retina, and no intraocular oil.Results: Fifty three patients were randomized to Group 1 and 55 patients to Group 2. The mean age of study subjects was 32 years and baseline clinical characteristics were similar in both groups. At the final follow-up visit at 9 months, the overall success rate of Group 2 (67.3%) was significantly better than Group 1 (43.4%; P=0.01). There were also fewer devastating complications (such as inoperable retinal detachment, phthisis bulbi) in Group 2 compared with Group 1 (21.8% versus 43.4%; P=0.01).Conclusion: The outcome at 9 months of patients with BEE treated by vitrectomy with silicone oil was better than those treated by vitrectomy alone. © 2014 Do et al. Source


Yuen L.,Singapore National Eye Center | Do N.H.,Vietnam National Institute of Ophthalmology | Vu Q.L.,Vietnam National Institute of Ophthalmology | Gupta S.,Johns Hopkins University | And 2 more authors.
Clinical and Experimental Ophthalmology | Year: 2011

Background: To evaluate cataract surgical outcomes in four rural districts of Ha Tinh Province, Vietnam. Design: Cross-sectional study. Participants: Post-cataract surgery patients sampled randomly from facilities in four rural districts of Ha Tinh Province >3 months after surgery. Main Outcome Measures: Postoperative visual acuity (VA), visual function and quality of life. Results: Among 412 patients, the mean age was 74.5±9.4 years, 67% (276) were female, and 377 (91.5%) received intraocular lenses (IOL). Nearly two-thirds of patients had no postoperative visits after discharge. Postoperatively, more than 40% of eyes had presenting VA <6/18, while 20% remained <6/60. The mean self-reported visual function and quality of life for all patients were 68.7±23.8 and 73.8±21.6, respectively. Most patients (89.5%) were satisfied with surgery and the majority (94.4%) would recommend surgery to others. One-third of patients paid ≥$US50 for surgery. In multiple regression modelling, older age (P<0.01), intraoperative complications (P<0.01) and failure to receive an IOL (P<0.01) were associated with postoperative VA <6/60. Conclusion: Satisfaction with surgery was high, and many patients were willing to pay for their operations. Poor visual outcomes were common; however, and better surgical training is needed to reduce complications and their impact on visual outcomes. More intensive postoperative follow-up may also be beneficial. © 2011 The Authors. Clinical and Experimental Ophthalmology © 2011 Royal Australian and New Zealand College of Ophthalmologists. Source


Dunstan S.J.,University of Oxford | Dunstan S.J.,University of Melbourne | Hue N.T.,Vietnam National University, Ho Chi Minh City | Han B.,University of Ulsan | And 44 more authors.
Nature Genetics | Year: 2014

Enteric fever affects more than 25 million people annually and results from systemic infection with Salmonella enterica serovar Typhi or Paratyphi pathovars A, B or C 1. We conducted a genome-wide association study of 432 individuals with blood culture-confirmed enteric fever and 2,011 controls from Vietnam. We observed strong association at rs7765379 (odds ratio (OR) for the minor allele = 0.18, P = 4.5 × 10 â '10), a marker mapping to the HLA class II region, in proximity to HLA-DQB1 and HLA-DRB1. We replicated this association in 595 enteric fever cases and 386 controls from Nepal and also in a second independent collection of 151 cases and 668 controls from Vietnam. Imputation-based fine-mapping across the extended MHC region showed that the classical HLA-DRB1∗04:05 allele (OR = 0.14, P = 2.60 × 10 â '11) could entirely explain the association at rs7765379, thus implicating HLA-DRB1 as a major contributor to resistance against enteric fever, presumably through antigen presentation. © 2014 Nature America, Inc. All rights reserved. Source

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