Fig. 4: Comparison of P-T symmetric circuit lens with conventional loss sensor lens. | npj Flexible Electronics

Fig. 4: Comparison of P-T symmetric circuit lens with conventional loss sensor lens.

From: Ultra-sensitive real-time monitoring of intraocular pressure with an integrated smart contact lens using parity-time symmetry wireless technology

Fig. 4

a The configuration of P-T symmetric PCB board. b The real and imaginary parts of the impedance from a conventional readout antenna coupled to a contact lens sensor (above) versus a P-T readout resonator coupled to a contact lens sensor (below). c The real part of the impedance in conventional antenna as IOP varies, measured by sensor-integrated contact lenses. d The real part of the impedance in the P-T antenna as IOP varies, measured by sensor-integrated contact lenses. e The graph illustrates the relationship between the absolute value of the relative change in the real part of the impedance, |ΔRe(Zin)/Re(Z0) |, and the change in IOP. f linear relationship (R² = 93%) between IOP and contact lens resistance Re (Zin) using a tonometer and PT lens sensor.

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