Impedance of Goat Lens as a Function of Frequency at DC Voltages 0, 50, 100, 200 mV

Abstract

Impedance characteristics of lens tissue has been studied using the AC impedance system (EG&G PARC, model 318) at different low voltage excitations using a Cole-Cole Plot. The extracellular resistance (Re), intracellular resistance (Ri), depressed angle (θ), total impedance (IZI), and phase angle (ϕ) of the tissue were measured. The impedance locus between the real part (Z′) and imaginary part (Z″) of the complex impedance of lens was examined at discrete frequencies ranging from 10 mHz to 10 Hz. A decrease in extra-cellular resistance (Re) and increase in distribution of the factor (α) of 56.8 KΩ, 48.1 KΩ, 32.8 KΩ, 13.4 KΩ, and 0.40, 0.43, 0.46, 0.53 were found at 0 mV, 50 mV, 100 mV, and 200 mV, respectively. The total impedance (| Z|) and phase angle (ϕ) were also evaluated and the observed frequency dependent for the frequency range was tested as a function of excitation voltage. An attempt has been made to explain the effect of voltage stress on lens impedance.