  There exists a large body of research on the lens of mammalian eye over the
past several decades. The objective of the current work is to provide a link
between the most recent computational models to some of the pioneering work in
the 1970s and 80s. We introduce a general non-electro-neutral model to study
the microcirculation in lens of eyes. It describes the steady state
relationships among ion fluxes, water flow and electric field inside cells, and
in the narrow extracellular spaces between cells in the lens. Using asymptotic
analysis, we derive a simplified model based on physiological data and compare
our results with those in the literature. We show that our simplified model can
be reduced further to the first generation models while our full model is
consistent with the most recent computational models. In addition, our
simplified model captures the main features of the full model. Our results
serve as a useful link intermediate between the computational models and the
first generation analytical models.
