STAFF and patients at Huddersfield Royal Infirmary could be forgiven for thinking they need their eyes testing, with two sets of identical twins in the same two departments.
Adele Huntington works in Ward 7, alongside Julia Thompson.
And their exact doubles, Maxine Cooper and Jill Pearson, work in operating theatres.
It can lead to confusion and funny looks all round as people try to fathom out who is who.
Julia said: "Students and new staff on the wards especially get mixed up.
"They see one of us working in one place, then see the other twin at another - and assume the person has switched places in seconds!
"If people actually see us together they can see a difference.
"But when they see one soon after the other it gets confusing."
Jill said: "At work someone once told me they'd just seen the double of me in the canteen and I said: `I know, I've got an identical twin.' "
Adele and Maxine were born four minutes apart at the Infirmary and completed their nurse training together in 1976.
Julia and Jill were born 40 minutes apart at the former Princess Royal Hospital in Greenhead Road and qualified at the same time 29 years ago.
The women, who all live in Huddersfield, share the same ultra-closeness common amongst twins.
For example, they have picked lookalike outfits for shopping and nights out - and had to change at the last minute!.
And when Julia was having her first baby, Jill, then on honeymoon in Hawaii, took to her bed with same-time stomach pains.
And the lookalike aspect of being twins has also come in useful over the years - especially where men are concerned.
Adele said: "When we were much younger I have dumped blokes for Maxine if she couldn't face it!"
Jill said: "We went on a double date and when we got there we changed men, just to confuse them for a laugh.
"And we are always getting people coming up and saying: `I know I've had a lot to drink, but I think I'm seeing double!' "