Am I right in assuming the 'may' in the second part of the text means you could still reroll a focus result against a ps 2 or lower?

Thanks

Yes. The first part gives you the option of rerolling an eye result when defending. The second clause allows you to reroll a blank if it is PS 2 or lower, yet you can still reroll the eye no matter what the PS level.

Does anyone ever us this card?

Nope. But I think I may have find a use...

Cheers sergovan for confirming my thoughts