Papers by Angela Voon Pei Loo
The Medical journal of Malaysia
Corneal perforation is an ocular emergency that requires early intervention to avoid permanent vi... more Corneal perforation is an ocular emergency that requires early intervention to avoid permanent visual loss from endophthalmitis or irreversible structural changes. Although tectonic keratoplasty is the best choice for patching a large perforation, a donor cornea is not always immediately available. Consequently, an alternative material is required while awaiting a donor cornea. We report the use of preserved bovine pericardium as a temporizing graft to maintain the ocular integrity in two patients with corneal perforation.
Journal of Cataract & Refractive Surgery, 2002
We present a case of traumatic lens subluxation that was evident only when the patient was in the... more We present a case of traumatic lens subluxation that was evident only when the patient was in the supine position. This case illustrates that a crystalline lens with traumatic zonular rupture can change its position depending on the posture of the patient. If such a lens is suspended by the remaining zonules at the superior quadrant while the patient is erect, phacodonesis may be present while the lens remains in its normal position. However, when the patient is in the supine position, the lens drops back into the vitreous cavity. Examination in erect and supine positions is important in the preoperative assessment of patients with traumatic phacodonesis or iridodonesis.
Graefe's Archive for Clinical and Experimental Ophthalmology, 2011
Purpose To describe the epidemiology of ocular injuries presenting to the University Malaya Medic... more Purpose To describe the epidemiology of ocular injuries presenting to the University Malaya Medical Centre (UMMC), Kuala Lumpur, Malaysia.
Eye, 2011
Purpose To assess the agreement of the optical low-coherence reflectometry (OLCR) device LENSTAR ... more Purpose To assess the agreement of the optical low-coherence reflectometry (OLCR) device LENSTAR LS900 with partial coherence interferometry (PCI) device IOLMaster and applanation and immersion ultrasound biometry. Methods We conducted the study at the
Eye, 2001
Pars plana vitrectomy with silicone oil in the management of combined rhegmatogenous retinal and ... more Pars plana vitrectomy with silicone oil in the management of combined rhegmatogenous retinal and choroidal detachment Abstract Purpose Rhegmatogenous retinal detachment combined with spontaneous pre-operative choroidal detachment (RDCD) represents a rare but specific entity, which has in the past been associated with a poor prognosis. This study was designed to determine the efficacy of pars plana vitrectomy with silicone oil injection in the management of this very difficult vitreoretinal problem. Methods A retrospective analysis was carried out of 13 eyes of 13 consecutive patients who underwent vitrectomy and silicone oil exchange. Results In a total of 10 eyes (77%) the first procedure produced anatomical success. Two eyes required a further procedure to achieve retinal reattachment, producing a final anatomical success rate of 92%. Conclusion Pars plana vitrectomy with silicone oil exchange is an effective technique for managing RDCD. Eye (2001) 15, 612-615
Eye, 2002
Purpose Macular hole surgery usually involves gas tamponade which necessitates a variable period ... more Purpose Macular hole surgery usually involves gas tamponade which necessitates a variable period of postoperative posturing in a face-down position. A number of patients find this difficult or impossible for medical or social reasons. This study reviews our experience of macular hole surgery using silicone oil tamponade with no restriction of posturing. Methods Sixteen consecutive cases of macular hole (stage III/IV) surgery where silicone oil was used for tamponade were reviewed. Group A patients were unable for medical or social reasons to maintain a facedown posture and Group B patients had previous failed surgery with gas tamponade.
Applied Optics, 2007
Noninvasive imaging techniques such as optical coherence tomography (OCT) are being widely used f... more Noninvasive imaging techniques such as optical coherence tomography (OCT) are being widely used for early diagnostics of a variety of pathologies. Traditional tissue preparation for histological evaluation alters the dimensions of histological images such that differences between the dimensions of histologic and OCT images can be as great as 2.5-fold. This discrepancy complicates quantitative interpretation of OCT images. Here we used a steel ring sewn to the pigskin to avoid tissue deformation due to excision and fixation and used a surgical suture as a fixed tissue marker. With these techniques, we achieved good correlation between OCT and histological images with differences of less than 10%. The resulting method significantly enhances the diagnostic capabilities of the OCT technique.
Retina, 2000
To evaluate the efficacy of topical anesthesia as an alternative to peribulbar or retrobulbar ane... more To evaluate the efficacy of topical anesthesia as an alternative to peribulbar or retrobulbar anesthesia in posterior vitrectomy procedures. Posterior vitrectomy using topical anesthesia (4% lidocaine drops) was performed prospectively in 134 eyes (134 patients) with various vitreoretinal diseases, including severe proliferative diabetic retinopathy (n = 69), vitreous hemorrhage (n = 12), rhegmatogenous retinal detachments (n = 11), epiretinal membranes (n = 10), macular holes (n = 7), dislocated crystalline lens or intraocular lens (n = 6), giant retinal tears (n = 5), intraocular foreign bodies (n = 3), trauma (n = 3), endophthalmitis (n = 3), subfoveal choroidal neovascular membrane (n = 3), and neovascular glaucoma (n = 2). In 26 (19.4%) eyes, posterior vitrectomy was combined with a scleral buckling procedure, and in 84 (62.6%) eyes, argon laser photocoagulation was performed. Preoperative and intraoperative sedation of varying degrees was necessary. Subjective pain and discomfort were graded from 1 (no pain or discomfort) to 4 (severe pain and discomfort). All patients had grade 1 pain and discomfort during most of the procedure. All patients had grade 2 (mild) pain and discomfort during pars plana sclerotomies, external bipolar cautery, and conjunctival closure. The average amount of 4% lidocaine drops needed during each procedure was 0.5 mL. No patient required additional retrobulbar, peribulbar, or sub-Tenon anesthesia. This technique avoids the risk of globe perforation, retrobulbar hemorrhage, and prolonged postoperative akinesia of the eye. With appropriate case selection, topical anesthesia is a safe and effective alternative to peribulbar or retrobulbar anesthesia in three-port pars plana vitrectomy procedures.
Uploads
Papers by Angela Voon Pei Loo