An ophthalmic device , comprising: an enclosure that is compatible for wearing in or on an eye; an adjustable lens disposed within the enclosure , wherein the adjustable lens includes drive terminals, and the adjustable lens has a parallel capacitance and a parallel resistance; driver circuitry disposed within the enclosure and coupled to the drive terminals of the adjustable lens to drive the adjustable lens and change an optical power of the adjustable lens; built-in-self-test (BIST) circuitry disposed within the enclosure and coupled to the adjustable lens , the BIST circuitry including an impedance measurement circuit coupled to the drive terminals of the adjustable lens to selectively measure an impedance of the adjustable lens ; and a controller disposed within the enclosure and including BIST control logic that, when executed by the controller , causes the controller to perform operations including: measuring the impedance of the adjustable lens with the impedance measurement circuit ; measuring one or both of the parallel capacitance or the parallel resistance with the impedance measurement circuit ; determining whether one or both of the parallel capacitance or the parallel resistance are within an acceptable range; and determining a health status of the adjustable lens based, at least in part, upon whether one or both of the parallel capacitance or the parallel resistance are within the acceptable range. an enclosure that is compatible for wearing in or on an eye; an adjustable lens disposed within the enclosure , wherein the adjustable lens includes drive terminals, and the adjustable lens has a parallel capacitance and a parallel resistance; wherein the adjustable lens includes drive terminals, and the adjustable lens has a parallel capacitance and a parallel resistance; driver circuitry disposed within the enclosure and coupled to the drive terminals of the adjustable lens to drive the adjustable lens and change an optical power of the adjustable lens; built-in-self-test (BIST) circuitry disposed within the enclosure and coupled to the adjustable lens , the BIST circuitry including an impedance measurement circuit coupled to the drive terminals of the adjustable lens to selectively measure an impedance of the adjustable lens ; and a controller disposed within the enclosure and including BIST control logic that, when executed by the controller , causes the controller to perform operations including: measuring the impedance of the adjustable lens with the impedance measurement circuit ; measuring one or both of the parallel capacitance or the parallel resistance with the impedance measurement circuit ; determining whether one or both of the parallel capacitance or the parallel resistance are within an acceptable range; and determining a health status of the adjustable lens based, at least in part, upon whether one or both of the parallel capacitance or the parallel resistance are within the acceptable range. measuring the impedance of the adjustable lens with the impedance measurement circuit ; measuring one or both of the parallel capacitance or the parallel resistance with the impedance measurement circuit ; determining whether one or both of the parallel capacitance or the parallel resistance are within an acceptable range; and determining a health status of the adjustable lens based, at least in part, upon whether one or both of the parallel capacitance or the parallel resistance are within the acceptable range. <EOS>