Electrochromic eyewear comprising: a. an eyewear frame comprising a first arm and a second arm, wherein at least one of the first and second arms comprise a hinge that connects the arm to the eyewear frame, the hinge comprising a set of interconnected knuckles and an electrical passthrough disposed within the set of interconnected knuckles; wherein the arm can rotate upon the hinge between an open and closed position; b. an electrochromic lens connected to the eyewear frame comprising electrical contacts; c. a controller contained within at least one of the first and second arms in electrical communication with the electrochromic lens, the controller configured to deliver a voltage to the electrochromic lens to vary the transmittance of the electrochromic lens in response to a stimulus transmitted to the controller; d. a power source contained within at least one of the first and second arms in electrical communication with the controller ; and e. a flexible circuit configured to maintain electrical communication between the electrochromic lens and the controller when at least one of the first and second arms is in their open or closed position, comprising: i. electrical contact pads connected to the eyewear frame and configured to releaseably contact the electrical contacts of the electrochromic lens; and ii. a flexible electrical conduit that connects the electrical contact pads to the controller through the electrical passthrough, wherein the frame comprises a front portion and a rear portion with the electrochromic lens disposed between the front portion and the rear portion, and wherein the frame comprises a photosensor cavity comprising a conically-shaped cross-section. a. an eyewear frame comprising a first arm and a second arm, wherein at least one of the first and second arms comprise a hinge that connects the arm to the eyewear frame, the hinge comprising a set of interconnected knuckles and an electrical passthrough disposed within the set of interconnected knuckles; wherein the arm can rotate upon the hinge between an open and closed position; b. an electrochromic lens connected to the eyewear frame comprising electrical contacts; c. a controller contained within at least one of the first and second arms in electrical communication with the electrochromic lens, the controller configured to deliver a voltage to the electrochromic lens to vary the transmittance of the electrochromic lens in response to a stimulus transmitted to the controller; d. a power source contained within at least one of the first and second arms in electrical communication with the controller ; and e. a flexible circuit configured to maintain electrical communication between the electrochromic lens and the controller when at least one of the first and second arms is in their open or closed position, comprising: i. electrical contact pads connected to the eyewear frame and configured to releaseably contact the electrical contacts of the electrochromic lens; and ii. a flexible electrical conduit that connects the electrical contact pads to the controller through the electrical passthrough, wherein the frame comprises a front portion and a rear portion with the electrochromic lens disposed between the front portion and the rear portion, and wherein the frame comprises a photosensor cavity comprising a conically-shaped cross-section. i. electrical contact pads connected to the eyewear frame and configured to releaseably contact the electrical contacts of the electrochromic lens; and ii. a flexible electrical conduit that connects the electrical contact pads to the controller through the electrical passthrough, wherein the frame comprises a front portion and a rear portion with the electrochromic lens disposed between the front portion and the rear portion, and wherein the frame comprises a photosensor cavity comprising a conically-shaped cross-section. <EOS>