Hard-eyed vs loose-eyed dogs

Is anyone teaching their upright herding dog to use their eye? When Ceara was but a tot, she could move sheep in the next arena just by glancing at them. She had her ups and downs while training and forgot that she had eye. We are just now getting back to putting it in her toolkit again. It's great to see her check herself and stare down a reluctant ewe, rather than charging in.