Purpose To determine the frequency of ocular diseases in infants visiting the ophthalmology department of a tertiary care hospital. Methods This was a cross-sectional descriptive study conducted in the department of ophthalmology, Abbasi Shaheed Hospital, from January 2015 to May 2016. The study included 377 infants ranging in age from 1 day to less than 1 year who were, selected by a nonprobability consecutive sampling technique. A detailed history was taken, and a complete ocular examination was performed. Descriptive statistics were used to calculate the mean and standard deviation for age. Frequencies were calculated for ocular diseases along with the percentages. Outcome variables included various congenital and acquired diseases such as conjunctivitis, congenital cataract, glaucoma, nasolacrimal duct blockage, squint, trauma, and fundus abnormalities. Results The mean age of infants was 5.0 ± 3.7 months. There were 196 (52%) males and 181 (48%) females. The sample included 330 (87.5%) full term infants. Acquired ocular diseases occurred in 230 (61%) infants; and congenital diseases, in 147 (39%). The most common ocular disease was conjunctivitis, which occurred in 173 (46%) infants, followed by congenital blocked nasolacrimal duct, which occurred in 57 (15 %) infants. Conjunctivitis was more common among neonates than infants. Conclusions Acquired ocular diseases were more common than congenital ocular diseases. The most common ocular pathology was conjunctivitis, followed by congenital nasolacrimal duct obstruction, in infants. Conjunctivitis was more common in neonates than infants.

In a typical 10G-Passive Optical Network (XG-PON), the propagation delay between the Optical Network Unit (ONU) and Optical Line Terminal (OLT) is about 0.3 ms. With a frame size of 125 μs, this amounts to three frames of data in the upstream and three frames of data in the downstream. Assuming no processing delays, the grants for any bandwidth requests reach the ONU after six frames in this request-grant cycle. Often, during this six-frame delay, the queue situation is changed drastically, as much, more data would arrive in the queue. As a result, the queued data that is delayed loses its significance due to its real-time nature. Unfortunately, almost all dynamic bandwidth allocation (DBA) algorithms follow this request-grant cycle and hence lacking in their performance. This paper introduces a novel approach for bandwidth allocation, called Demand Forecasting DBA (DF-DBA), which predicts ONU’s future demands by statistical modelling of the demand patterns and tends to fulfil the predicted demands just in time, which results in reduced delay. Simulation results indicate that the proposed technique out-performs previous DBAs, such as GigaPON access network (GIANT) and round robin (RR) employing the request-grant cycle in terms of Throughput and Packet delivery ratio (PDR). Circular buffers are introduced in statistical predictions, which produce the least delay for this novel DF-DBA. This paper, hence, opens up a new horizon of research in which researchers may come up with better statistical models to brew better and better results for Passive optical networks.

In QoS-enabled network, for example ATM, connections which exhibit rapidly changing traffic characteristics, renegotiating the bandwidth requirements becomes inevitable. The sender initiates renegotiation whenever bandwidth requirements change. If the newly requested bandwidth is not granted, the sender keeps on invoking the follow-up renegotiations with some frequency. Polling the network too often results in huge overhead traffic and a decrease in the throughput. While invoking follow-ups too infrequently results in the under-utilization of the network. Predicting an optimal follow-up rate is a hard problem. We have earlier proposed a Feedback Based UPC-Parameters Renegotiation Protocol for ATM networks which resolves this problem. In in this paper with simulation results we show that the proposed protocol is scalable and reliable. 

Purpose:  To evaluate the frequency, causes and management of pseudophakic glaucoma among the pseudophakic patients presenting in a tertiary care hospital of Pakistan. Study Design:  Descriptive cross sectional study. Place and Duration of Study:  Department of Ophthalmology, Abbasi Shaheed Hospital, Pakistan, from August 2017 to June 2018. Material and Methods:  Adult patients between 50 to 70 years of age with pseudophakic glaucoma were included in the study by non-probability convenience sampling after institutional review board approval. Patients with primary open angle, primary angle closure, traumatic glaucoma, diabetes mellitus and hypertension were excluded. Pseudophakic glaucoma was labeled in case of cataract surgery with intraocular lens implantation and intraocular pressure > 21 mmHg or more in one eye along with glaucomatous optic disc or retinal nerve fiber layer defect on OCT (optical coherence tomography). Frequencies were computed for categorical variables. Data was analyzed on SPSS version 20. Results:  Twenty-eight eyes with pseudophakic glaucoma were studied. There were 15 (53.57%) males. Mean age was 63 ± 10.4 SD years. Mean IOP was 30.78 ± 7.5 mm Hg. Patients with extracapsular cataract extraction were 18 (64.2%) and 10 (35.8%) had phacoemulsification. Most frequent cause was posterior capsular rupture (n = 16, 57.1%) followed by pupillary block, (n = 4, 14.2%) and UGH (n = 3, 10.7%). Medical treatment was successful in 20 (71.4%) and surgical treatment was done in 8 patients. Conclusion:  Most common causes of pseudophakic glaucoma are posterior capsular rupture, vitreous loss, uveitis and pupillary block. Pseudophakic glaucoma is more common with anterior chamber intraocular lenses and extracapsular cataract extraction.