A system may include an image sensor having a pixel array that receives light in an environment. The light received at the pixel array may be transmitted by an external device that encodes information using the wavelength, spatial patterning, temporal patterning, or other characteristics of the light. In response to receiving the light, the pixel array may generate electrical signals that are processed to decode the information in the light. The system may compare the decoded information to user preferences to determine if the information is relevant to a user. In response to determining that the information is relevant to the user, the system may display the information to the user, transmit a pulse including user preference information, or change an operating state of the image sensor.