Patent ID: 8886275

Claim:
An eye-mountable device comprising: a transparent polymeric material having a concave surface and a convex surface, wherein the concave surface is configured to be removably mounted over a corneal surface and the convex surface is configured to be compatible with eyelid motion when the concave surface is so mounted; and a substrate at least partially embedded in the transparent polymeric material, wherein the substrate comprises (i) an electrochemical sensor that includes a working electrode and a reference electrode and (ii) an electronics module encapsulated within a bio-compatible material such that tear fluid permeating the transparent polymeric material is isolated from the electronics module by the bio-compatible material, wherein the bio-compatible material includes a first layer and a second layer in which the electronics module is interposed between the first and second layers and portions of the first and second layers are annealed together, wherein the electronics module includes: an antenna; and a controller electrically connected to the electrochemical sensor and the antenna, wherein the controller is configured to control the electrochemical sensor to obtain a sensor measurement related to a concentration of an analyte in a fluid to which the eye-mountable device is exposed and use the antenna to indicate the sensor measurement.