Since WordPress 4.0 some users cannot find the column with Optimus values. The column can still be found in the media library, but it can only be seen in list view. The grid view (available images are placed next to each other) in the medial library does not display any type of image information, which is why there are no Optimus circles visible in it either.
Optimus in the WordPress media library
The button for switching between the list view with information columns and the grid view with „detached“ images is shown in the screenshot.