Drawing eyes - The structure of the eyes

Here is a great link to a video with bags of details about the structure of eyes. He goes into a lot of detail about the anatomy of the eye and what to watch out for when drawing eyes. The video is around 8 minutes long. You may want to pause and review parts of it as it so full of information.

https://www.youtube.com/watch?v=u6-bCgRmcko