Lawrence P. L. Iu

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In this paper, we address the problem of image content characterization in the compressed domain for the facilitation of similarity matching in content-based image retrieval. Specifically, given the disparity of the content characterization power of compressed domain approaches and those based on pixel-domain features, with the latter being usually(More)
PURPOSE To report the clinical course of a patient sustaining a ocular laser injury from 1,064-nm Nd:YAG cosmetic laser machine. METHOD AND PATIENT A 31-year-old beauty parlor aesthetician was operating an Nd:YAG cosmetic laser machine of 1,064 nm wavelength. However, the probe was held in the opposite direction, and on firing, the laser shot fired into(More)
PURPOSE To evaluate the features of acute retinal pigment epitheliitis (ARPE) at onset and in the course of recovery by serial spectral-domain optical coherence tomography (SD OCT) and the correlation to visual acuity (VA). DESIGN Retrospective cohort study. PARTICIPANTS Consecutive patients with ARPE. METHODS A review of medical records was(More)
PURPOSE To explore the efficacy of half-dose verteporfin photodynamic therapy (hd-PDT) and standard-dose photodynamic therapy (sd-PDT), when combined with ranibizumab in the treatment of polypoidal choroidal vasculopathy. METHODS Subjects were allocated to either the hd-PDT arm or the sd-PDT arm. All subjects received an injection of ranibizumab and PDT(More)
PURPOSE OF REVIEW The advancement of optical coherence tomography has improved the resolution of in-vivo images of the retina. This has led to a wealth of novel knowledge regarding the microstructures of the photoreceptor layer and its relationship with visual functions under different pathological diseases. RECENT FINDINGS Identification of the(More)
Optical coherence tomography (OCT) is a noninvasive imaging modality providing high-resolution images of the central retina that has completely transformed the field of ophthalmology. While traditional OCT has produced longitudinal cross-sectional images, advancements in data processing have led to the development of en-face OCT, which produces transverse(More)
We reported a rare case of intraocular post-transplant lymphoproliferative disorder (PTLD) arising in a 3-year-old liver transplant recipient who had a prior history of systemic PTLD. The first PTLD entered remission after treatment with intravenous rituximab and withdrawal of immunosuppressants. One year after remission, she presented with granulomatous(More)
OBJECTIVES To review the role of conventional and new treatment modalities in the management of neovascular age-related macular degeneration. DATA SOURCES AND EXTRACTION Literature search of Medline till March 2007, using the key words/terms 'treatment' and 'age-related macular degeneration' to retrieve relevant original papers and review articles. DATA(More)
Renal transplant recipients (RTRs) are subject to a variety of opportunistic infections. We present a rare case of varicella zoster virus-derived progressive outer retinal necrosis in an RTR, who presented with painless visual blurring. This clinical entity heralds an extremely poor visual prognosis and is an important condition to consider in any(More)
BACKGROUND To evaluate the efficacy and safety of half-dose photodynamic therapy (PDT combined with ranibizumab for polypoidal choroidal vasculopathy (PCV). PCV is commonly treated with a combination of anti-vascular endothelial growth factor and standard-dose photodynamic therapy (PDT). Choroidal ischemia and visual loss can be resulted from the(More)