Bride-only wedding ring ceremony

I've photographed ceremonies where there's only one ring. You hardly notice any difference really. In fact, some vicars/registrars do both rings at the same time (in a two ring ceremony)

I was MOH recently and only the bride had a ring. He said the I give you this ring bit, and then she said I accept this ring as a sign of etc, it was a lovely way of doing it

Just out of curiosity, why do some men chose not to have a ring?

Thanks for the replies everyone, yes I'm sure the registrar will be able to talk us through it and MrsShep I really like the sound of that!

Re men who don't choose to wear a ring I suppose they each have their own reasons. For my H2B it's down to the fact that he's never worn jewellery or a watch and also works in a job where he would have to take it off. He tried some on and didn't like the look or feel. Like when I tried on a veil I suppose.