An optical system comprising: an underlying device, the underlying device configured to provide output light in a first spectrum from input light received at the underlying device; a transparent optical device optically coupled in an overlapping fashion to the underlying device, wherein the transparent optical device is configured to transmit light in the first spectrum from the underlying device through the transparent optical device to display a scene to a user, the transparent optical device comprising: a first plurality of active elements formed in an active area of the transparent optical device configured to cause the transparent optical device to detect light portraying at least a portion of the scene; and a first plurality of transparent regions formed in the active area which are transparent to the light in the first spectrum to allow light in the first spectrum to pass through from the underlying device to a user; and the optical system further comprising an image processor configured to: process images produced using light detected by the first plurality of active elements to identify a specific instance of light in the scene; and cause a second plurality of active elements in the active area of the transparent optical device to display an indicator, in the scene, to the user, correlated to the specific instance of light, including during a change in the scene, characterized in that the transparent optical device is implemented on a single semiconductor chip. an underlying device, the underlying device configured to provide output light in a first spectrum from input light received at the underlying device; a transparent optical device optically coupled in an overlapping fashion to the underlying device, wherein the transparent optical device is configured to transmit light in the first spectrum from the underlying device through the transparent optical device to display a scene to a user, the transparent optical device comprising: a first plurality of active elements formed in an active area of the transparent optical device configured to cause the transparent optical device to detect light portraying at least a portion of the scene; and a first plurality of transparent regions formed in the active area which are transparent to the light in the first spectrum to allow light in the first spectrum to pass through from the underlying device to a user; and the optical system further comprising an image processor configured to: process images produced using light detected by the first plurality of active elements to identify a specific instance of light in the scene; and cause a second plurality of active elements in the active area of the transparent optical device to display an indicator, in the scene, to the user, correlated to the specific instance of light, including during a change in the scene, characterized in that the transparent optical device is implemented on a single semiconductor chip. a first plurality of active elements formed in an active area of the transparent optical device configured to cause the transparent optical device to detect light portraying at least a portion of the scene; and a first plurality of transparent regions formed in the active area which are transparent to the light in the first spectrum to allow light in the first spectrum to pass through from the underlying device to a user; and the optical system further comprising an image processor configured to: process images produced using light detected by the first plurality of active elements to identify a specific instance of light in the scene; and cause a second plurality of active elements in the active area of the transparent optical device to display an indicator, in the scene, to the user, correlated to the specific instance of light, including during a change in the scene, characterized in that the transparent optical device is implemented on a single semiconductor chip. process images produced using light detected by the first plurality of active elements to identify a specific instance of light in the scene; and cause a second plurality of active elements in the active area of the transparent optical device to display an indicator, in the scene, to the user, correlated to the specific instance of light, including during a change in the scene, characterized in that the transparent optical device is implemented on a single semiconductor chip.