The filtered results, plus the activated lens should inherit the Options filtering, if the activated lens doesn't have those variables.
Search for any keyword, and set some filters in the Options menu: date, location, etc.
The filtered result will be displayed accordingly.
As soon as I decide to apply an active lens I've customized, the Options filters are reset.
The active lens I've customized doesn't have any variables in the 'results before this date' and 'after this date' boxes.