Frank, There are two common test circulating the medical community for pilots.
One is the parrot test---Unfortunately it would not be appropriate to post that one here---In the interest of discretion, Soccermom would not allow me.
I can however post the more "widely" used test:
1. Turn off the lights in the room.
2. Allow 20 minutes for your eyes to adjust to your computer screen BEFORE scrolling down.
3. After your eyes have adjusted---scroll down to the picture below.
4. Stare at the picture for 5 seconds and then complete the review below it.
Scroll down when and ONLY when your eyes are adjusted
Review: If you saw two dolphins---WELCOME to the world of aviation---you passed the test. If not, please drink copious amounts of martoonis and retry at a later time.
Sorry Frank---could not resist...