No hay más ciego que el que no quiere ver

No hay más ciego que el que no quiere ver
 

In English?

Look here. You can add 'There are' to the beginning of the English sentence, or you can use the more popular "There's."
Many people think that 'none' is always singular. That's a false notion. It can mean 'not any' just as much as it can mean 'not one'.

There is [not one] so blind as those.
There are [not any] so blind as those.
There is [not one] so blind as he.
There are [not any] so blind as he.

:)