I think that many people (incl. me) - unless they're very security-conscious - turn the Attention thing off because it makes the recognition faster. Then I would be surprised if the recognition didn't work well just because of the lazy eye - surely it's a permanent and consistent feature of your boat (Cockeye rhyming thing there ).
I really like the face recognition and how fast it is. However today I couldn't work out why it didn't open - then remembered I was holding a ballpoint pen horizontally in my lips as I picked up the phone.