A wearable apparatus is provided for capturing and processing images from an environment of a user. In one implementation, a system for controlling one or more controllable devices includes a transceiver and at least one processing device. The processing device is programmed to obtain one or more images captured by an image sensor included in a wearable apparatus, analyze the one or more images to identify a controllable device in an environment of a user of the wearable apparatus, analyze the one or more images to detect a visual trigger associated with the controllable device and, based on the detection of the visual trigger, transmit, via the transceiver, a command. The command may be configured to change at least one aspect of the controllable device.