I've been working on an eye sculpting tutorial for a while now, it's going to cover pickign the right size eye, making fake glass eyes out of polymer clay or glass beads, and sculpting a human eye.  Now It's not a small project so I have a fair bit left to do before I'm finished.  However I have uploaded a chart of eye sizes of several species at various common scales for sculpture (life size down to 1/12 scale) to share on the Clubhouse and other sculpting forums.  Since I'm not ready yet to add this to the tutorial page on my website I'm putting it it up here so people can check it out, give me comments, suggest other species to add. I have to give some credit to Vandyke Taxidermy they have a chart of life size eyes for several species that I've included along with those I dug up through my own research.  I hope this is useful for someone, if it is let me know.

Eye Size Chart