Quote Originally Posted by Hans Weilenmann View Post
I think you mean imago (spinner to you and me).
The fly pictured is a dun (not a spinner) American March Brown (Maccaffertium vicarium).

When I'm tying a fly with prominent, highly colored eyes, I usually tie a large head of the appropriate color. I'll even switch to a heavier thread for the head for just that reason. I personally believe the eyes/head are a hot spot. On flies where I tie off behind the hackle, I'll add a large false head as the first step in tying.

On flies without a prominent head or eyes, the "eye of the hook is the head" is as good theory as any.

I think issue is more important with wet flies than dry. I doubt that the eyes are even visible to the fish on a floating fly.