The complex electrical impedance of a goat eye lens is studied in the
frequency range 10mHz-10Hz at room temperature, using a computer-contr
olled AC impedance system. AC impedance software (model 368, version 2
.2) is employed to determine the total impedance and capacitance of th
e eye lens at various frequencies. A Cole-Cole plot of the eye lens ma
terial is drawn between the real component of impedance Z' and the ima
ginary component Z '' for each excitation frequency that shows a perfe
ct are of a semicircle, with its centre lying below the abscissa at an
angle of 35 degrees. The half-angle phi between R-0 and R-infinity is
found to be 55 degrees, which mathematically demonstrates the selecti
ve permeability of the eye lens. Using graphical analysis of the Cole-
Cole plot, characteristic frequency f(c) and distribution factor alpha
are observed to be 1 Hz and 0.77, respectively. At characteristic fre
quency, capacitance and total impedance are found to be 1.14 mu F and
9.08 k Omega. The effect of electrode polarisation on capacitance is c
orrected, based on Fricke's power function. The observed electrical pa
rameters are then used to explain the multiple current path through va
rious tissue compartments. Further, an attempt is made to explain the
results on the basis of a possible dipolar model.