It is obvious on machines how you test for intermediate distance for DSE user.. . and many firms do no want to pay for everyone to get a test at an optician if they can conveniently satisfy their workforce with a box screen test.

Having said that I believe if a company takes on the Vision Express corporate scheme , they send someone out to the site with a box screener to do this bit...

For forklift truck I have seen a stereopsis test added e.g.

The Home Office guidance suggests that prospective police officers who have had laser surgery to the eye should have testing done under dim light conditions...and in the Force I do some work for, all vision screening is done by the Driving School with a Keystones.New recruits provide, and pay their own optician eyetest, this is additional testing for dim light on a handful of people.