Mohammad Reza Pakravan

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Neovascular glaucoma is a secondary glaucoma with grave prognosis which follows ischemic retinal disorders in the majority of cases. Mediators that induce new vessel formation such as the vascular endothelial growth factor-A seem to play a key role in the pathophysiology of this condition. Herein, we report 2 cases with neovascular glaucoma secondary to(More)
PURPOSE To determine hearing thresholds at sound frequencies important for speech comprehension in subjects with ocular pseudoexfoliation and to compare them with that of age- and sex-matched controls without pseudoexfoliation. DESIGN Case-control study. PARTICIPANTS Eighty-three subjects with ocular pseudoexfoliation and 83 age- and gender-matched(More)
The mutation spectrum of CYP1B1 among 104 primary congenital glaucoma patients of the genetically heterogeneous Iranian population was investigated by sequencing. We also determined intragenic single nucleotide polymorphism (SNP) haplotypes associated with the mutations and compared these with haplotypes of other populations. Finally, the frequency(More)
This paper studies the statistical properties of the signal-to-noise ratio (SNR) of the dual-hop relaying link in a cooperative wireless communication system in the presence of channel estimation errors for fixed-gain (FG) and variable-gain (VG) relays. The SNR expression is derived and three different analytical approaches with different simplifying(More)
This article proposes a new architecture for distributed data management and update massage exchange in massively multiuser virtual environments. The key points in the design of such environments are scalability and QoS-aware message delivery. Therefore it requires robust distributed algorithms in a dynamic peer-to-peer system with frequent node arrivals(More)
An enhanced media access control (MAC) layer protocol that uses the signaling method benefits of the physical layer in order to provide different levels of quality to different users in optical code-division multiple-access (OCDMA) packet networks is presented. In the proposed network architecture the users are categorized into two classes of service, one(More)
Massively multi user virtual environment (MMVE) applications must face the challenge of dealing with update message exchange among a large set of nodes distributed over the Internet. Therefore design of scalable network protocols is a major concern in such large scale distributed architectures. Several approaches have been proposed to aid update exchange in(More)
PURPOSE To determine the effect of intravitreal bevacizumab (IVB) on neovascular glaucoma (NVG) in terms of iris neovascularization (NVI), intraocular pressure (IOP), and visual acuity. METHODS This randomized controlled trial included 26 eyes of 26 patients with NVG. All eyes received conventional treatment for NVG and were randomly allocated to three(More)
BACKGROUND To present the effect of erythropoietin for the treatment of methanol optic neuropathy. METHODS Two patients with methanol optic neuropathy were treated with 10,000 IU of intravenous erythropoietin twice a day for 3 days, 500 mg of methylprednisolone twice a day for 5 days (followed by 2 weeks of oral prednisolone [1 mg/kg per day]), and daily(More)
OBJECTIVE To investigate penetrance and expressivity of CYP1B1 genotypes associated with primary congenital glaucoma (PCG). DESIGN Observational case series, systematic review, and comparative analysis of the literature. PARTICIPANTS Forty probands affected with PCG, 16 siblings affected with PCG, and 103 siblings and 75 parents of the probands reported(More)