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Biology subjects

Annan, W. E.

Publications and source records attributed to Annan, W. E..

2 recordsLinked to original sources

Mathematical Model for the Progression of Rhegmatogenous Retinal Detachment (RRD)

The separation of the neural layer (NL) and the retinal pigmented epithelium (RPE), referred to as retinal detachment (RD), is a disease of vertebrate eyes affecting nearly twenty eight thousand individuals in the United States annually. The rate at which RD progresses--especially in response to constant eye movement--and the factors influencing this progression remain poorly understood. This lack of quantitative insight contributes to delays in treatment which can lead to permanent vision loss. In this work, we develop a mathematical model to investigate the progression of retinal detachment over two saccadic eye rotation. We explore how various model parameters--describing fluid properties, biomechanical properties of the retina, molecular properties of the bond between the NL and the RPE, as well as geometric and physical properties of the eye--affect disease progression.

biophysics↗

Mathematical model for rod outer segment dynamics during retinal detachment and reattachment

Retinal detachment (RD) is the separation of the neural layer from the retinal pigmented epithelium thereby preventing the supply of nutrients to the cells within the neural layer of the retina. In vertebrates, primary photoreceptor cells consisting of rods and cones undergo daily renewal of their outer segment through the addition of disc-like structures and shedding of these discs at their distal end. When the retina detaches, the outer segment of these cells begins to degenerate and, if surgical procedures for reattachment are not done promptly, the cells can die and lead to blindness. The precise effect of RD on the renewal process is not well understood. Additionally, a time frame within which reattachment of the retina can restore proper photoreceptor cell function is not known. Focusing on rod cells, we propose a mathematical model to clarify the influence of retinal detachment on the renewal process. Our model simulation and analysis suggest that RD stops or significantly reduces the formation of new discs and that an alternative removal mechanism is needed to explain the observed degeneration during RD. Sensitivity analysis of our model parameters points to the disc removal rate as the key regulator of the critical time within which retinal reattachment can restore proper photoreceptor cell function.

cell biology↗