yes "legit" twitter accounts can and are often verified, many are not (a lot of footballers for example) it is not as cut n dry as "official organisations/celebrity" having a "verified account" The RNIB for example is not a verified account yet is the voice of that charity.
but by the twitter account using the groups logo to the world it can be seen easily as being a voice for the charity.
the fact the about for the twitter account in question states
Creating awareness, providing information, support & guidance on Keratoconus. We are a registered UK charity, support us & join our forums online.keratoconus-group.org.uk
this would imply it is the voice of the charity, I find it very contradictory to be there, and I am ssure I am not the only one who does, the key word in the about is OUR so "come and join OUR" says it is the voice of...
I assuemd it was the charity on twitter so sent a tweet to fnd out who was behind the twitter which is how I discovered what I did...
and in fact when i asked on twitter to that twitter where the forum was got a reply back saying WE whcih again says to me someone isn't being honest about this twitter account,
again I am asking for honesty as don't feel I am being given it.