Prakhar Chaudhary - Academia.edu (original) (raw)

Papers by Prakhar Chaudhary

Solid State Technology, Apr 30, 2020

JOURNAL OF CLINICAL AND DIAGNOSTIC RESEARCH, 2022

Introduction: Pseudoexfoliation (PEX) is a systemic disease characterised by the accumulation of ... more Introduction: Pseudoexfoliation (PEX) is a systemic disease characterised by the accumulation of dandruff like fluffy deposits of fibrillar granular material. It is the most common cause of secondary open angle glaucoma. Pseudoexfoliation Glaucoma (PXG) is typically associated with rapid visual field loss, greater severity of optic neuropathy and pressure spikes. Aim: To evaluate the clinical characteristic of Pseudoexfoliation Syndrome (PXS) and PXG in the eastern part of Uttar Pradesh. Materials and Methods: This retrospective cross-sectional study was done at Sitapur Eye Hospital, Sitapur, Uttar Pradesh, India. The authors reviewed the medical records database to identify all patients aged 35 years or older with PXG or PXS who attended the outpatient clinic between January 1, 2020 and January 31, 2021. Ethical approval was obtained from the Institutional Review Board at Sitapur Eye Hospital, Sitapur. Continuous variables were calculated by Mann-whitney and student t-test and qual...

Journal of Clinical and Diagnostic Research, 2020

Introduction: Pigmentary Glaucoma (PG) and Pigment Dispersion Syndrome (PDS) are two different sp... more Introduction: Pigmentary Glaucoma (PG) and Pigment Dispersion Syndrome (PDS) are two different spectrums of a single disease. Since the disease is seen in younger population and is rapidly progressive blinding disease, therefore early diagnosis and treatment will reduce the burden of the disease and improve the quality of life. Aim: To evaluate clinical characteristics of PDS and PG patients in eastern part of Uttar Pradesh. Materials and Methods: This was a two years (1st January 2018 to 31st December 2019) hospital‑based retrospective cross‑sectional study of patients who attended the glaucoma clinic. Diagnosis of PDS was made when they had normal optic disc, normal visual field {with or without increased Intra Ocular Pressure (IOP)} and at least two of the following three signs were found clinically: Krukenberg spindle, homogenous moderate‑to‑heavy (≥Spaeth 2+) Trabecular Meshwork (TM) pigmentation, and any degree of zonular and/or lenticular pigment granule dusting. Patients wit...

Background: Cataract is the major cause of blindness in developing nations, in India it has been ... more Background: Cataract is the major cause of blindness in developing nations, in India it has been reported to be responsible for 50-80% of the bilaterally blindness in the country. Patients coming for community cataract surgery are being screened for retinal diseases which are third most blinding condition after cataract and glaucoma. Methods: This was a hospital based retrospective study. Patients included were of age between 40 to more than 80 years of age from 1st September to 31st December 2019. Comprehensive ocular and systemic examinations were done. Results: The age ranged from 40 to >80 years with a mean±SD age of 69.64±7.31 years. Mean±SD age of men was 69.98±7.37 years, and women were 69.36±7.26 years. Nearly half of the study subjects (48.5%) were between 60 and 69 years of age, whereas 3.9% were of 80 years and above. The prevalence of unilateral retinal disorders was 18.9% (95% CI: 17.2–20.8%), while bilateral retinal disorders was 33.5% (95% CI: 31.2–35.6%) The preva...

Introduction to AI Techniques for Renewable Energy Systems, 2021

International Journal of Contemporary Pediatrics, 2020

Background: Cataracts in children are rare, accounting 7.4-15.3% of pediatric blindness. Pediatri... more Background: Cataracts in children are rare, accounting 7.4-15.3% of pediatric blindness. Pediatric cataract is a treatable leading cause of childhood blindness. Rashtriya bal swasthya karyakram (RBSK) is an important initiative aiming at early identification and early intervention for children from birth to 18 years. The objective of our study was to know the impact of RBSK, in management of childhood cataract, at a tertiary eye care center.Methods: This was a hospital based retrospective study, done from December 2018 to December 2019. This study included all patients of congenital and developmental cataract during this study period. The patients aged less than or equal to 18 years were included. All statistical analyses were done at 5% (p<0.05) significance using Graph Pad instat version 3.0 and Microsoft excel 2019.Results: During a study period of thirteen months, 357 eyes of 210 patients with congenital or development cataract were included. There were 142 (67.61%) male pati...

Journal of Clinical Ophthalmology and Research, 2020

Immune recovery uveitis (IRU) is the ocular manifestation of immune reconstitution inflammatory s... more Immune recovery uveitis (IRU) is the ocular manifestation of immune reconstitution inflammatory syndrome in human immunodeficiency virus (HIV)-infected patients with cytomegalovirus (CMV) retinitis receiving highly active antiretroviral therapy (HAART). Here, we report the case of a 48-year-old HIV-infected patient, with poor adherence to HAART, who presented with gradual diminution of vision and pain in the left eye for 2 months. HAART was restarted along with anti-tubercular treatment for central nervous system tuberculosis 6 months ago. Clinical examination revealed the features of uveitis and active CMV retinitis. Laboratory investigations showed increased CD4+ T-lymphocyte count. We diagnosed the case as IRU associated with active CMV retinitis. The patient recovered with topical steroid and oral anti-CMV therapy. Although IRU is commonly seen in patients with inactive CMV retinitis, rarely this may be seen in association with active CMV retinitis, particularly when HAART therapy is initiated without treating CMV retinitis.

International Surgery Journal, 2020

Background: Over the past several decades there have been many advances in the equipment, instrum... more Background: Over the past several decades there have been many advances in the equipment, instrumentation and techniques of performing cataract surgery. This article will address the profile of intraoperative complications in cataract surgery.Methods: In this retrospective study all cataract procedures performed (n=18775) during the two years period (i.e. 2017 and 2018) were analysed and total 1401 (7.46%) valid cases (those having complications) were seen with 686 (49.0%) and 715 (51.0%) cases in the year 2017 and 2018 respectively. The age, gender, and side of the eye operated on were noted. The yearly incidence of the profile of complications was analysed. Results: Out of the total 1401 cases of eventful cataract surgery majority of the cases were of the age range of 51-70 years 1140 (6.07%) males were slightly higher in number i.e. 710 (3.78%) whereas females were 691 (3.68%), right eye was majorly operated for cataract i.e. 760 (4.05%). Manual small incision cataract surgery (M...

International Surgery Journal, 2021

Background: Phacomorphic glaucoma is highly prevalent in developing countries. In India, the prev... more Background: Phacomorphic glaucoma is highly prevalent in developing countries. In India, the prevalence of phacomorphic glaucoma is 3.91%. The definitive treatment of phacomorphic glaucoma is surgery. The purpose of our study was to compare the surgical technique and outcomes of phacoemulsification and manual small incision cataract surgery (MSICS), in management of phacomorphic glaucoma and analysis of the risk factors for developing phacomorphic glaucoma. Methods: This was a hospital based retrospective study done at a tertiary eye care center, over a period of nineteen months. A rigorous protocol to diagnose phacomorphic glaucoma was followed. All patients were given IV mannitol 20%, before surgery. The study patients were divided in to phaco group and MSICS group. The data analysis was done using Statistical Package for Social Sciences (SPSS) version 21.0. Results: Out of 99 phacomorphic glaucoma cases, 37 underwent phacoemulsification and 62 underwent MSICS. The total number o...

International Journal of Research in Medical Sciences, 2020

Background: Glaucoma is the leading cause of irreversible blindness worldwide. It is very importa... more Background: Glaucoma is the leading cause of irreversible blindness worldwide. It is very important to diagnose glaucoma in early stages so that timely management can be done. Spectral domain optical coherence tomography (SD-OCT), is a newer device which helps to diagnose glaucoma early. The aim of our study was to evaluate the RNFL, ONH, and mGCA (GCL+IPL) measurements for early glaucoma detection using spectral domain optical coherence tomography (SD-OCT).Methods: Total 30, POAG (primary open angle glaucoma) suspects were compared with 30 normal controls. The Cirrus HD-OCT optic disc cube 200 × 200 protocol was used to measure ONH, RNFL and macular parameters.Results: The average cpRNFL thickness of all quadrants was significantly lower in POAG suspects, (84.13±7.42 μm versus 103.85±8.95 μm, p<0.001). The superior GCL+IPL thickness of POAG suspects and controls was 75.75±2.60 μm and 80.05±1.74 μm, respectively, (p<0.001). The inferior GCL+IPL thickness of POAG suspects and c...

TNOA Journal of Ophthalmic Science and Research, 2019

In this case report, we present a unique case of varicella zoster virus (VZV) infection that pres... more In this case report, we present a unique case of varicella zoster virus (VZV) infection that presented with unilateral panuveitis. The patient came with complaints of burning sensation of his left eye, and on examination, the presence of viral pocks over the face and trunk, anterior chamber cells and flare, and iritis were noted along with vitritis and retinitis and he was diagnosed as left eye VZV-associated panuveitis. VZV infection can present with panuveitis in rare occasions, and this is the first of its kind to be reported in India.

Efficient user revocation is a necessary but challenging problem in many multi-user cryptosystems... more Efficient user revocation is a necessary but challenging problem in many multi-user cryptosystems. Among known approaches, server-aided revocation yields a promising solution, because it allows to outsource the major workloads of system users to a computationally powerful third party, called the server, whose only requirement is to carry out the computations correctly. Such a revocation mechanism was considered in the settings of identity-based encryption and attribute-based encryption by Qin et al. (2015, ESORICS) and Cui et al. (2016, ESORICS ), respectively. In this work, we consider the server-aided revocation mechanism in the more elaborate setting of predicate encryption (PE). The latter, introduced by Katz et al. (2008, EUROCRYPT), provides fine-grained and role-based access to encrypted data and can be viewed as a generalization of identity-based and attribute-based encryption. Our contribution is 2-fold. First, we formalize the model of server-aided revocable PE (SR-PE), with rigorous definitions and security notions. Our model can be seen as a non-trivial adaptation of Cui et al.’s work into the PE context. Second, we put forward a lattice-based instantiation of SR-PE. The scheme employs the PE scheme of Agrawal et al. (2011, ASIACRYPT) and the complete subtree method of Naor et al. (2001, CRYPTO) as the two main ingredients, which work smoothly together thanks to a few additional techniques. Our scheme is proven secure in the standard model (in a selective manner), based on the hardness of the learning with errors problem.