This has been a topic lately on a few ATC websites - atccti.com - in particular. A couple applicants were told this within the last week regarding their initial medical test for an ATC position. Apparently, they are going to begin administering a new test for ATC applicants as the 'strip test' and possibly even the farnsworth are not up to par for the new URETS system/monitors.
Previously they allowed ATC applicants 3 different tests: the Dvorine, a 'modified' Farnworth lantern in which 27 pairs of lights are shown, as opposed to the pilot test in which 9 are shown, and lastly a 'strip test' in which the applicant must identify specific colors/ink in a dark room. Recently applicants were told that the strip test was no longer valid and the farnsworth may be called in to question as well. This is straight from the Flight Surgeons they went to for the ATC medical. Will it carry over to the pilot side? Doesn't seem that way - seems to be ATC specific.