I think understanding not only parts of the eye is important and the functions of each part, but a la the 2012 HSC being able to identify/understand an experiment that was representative of an eye (my fave Q in communication w00t).
Also something you gotta be nitpicky on around section 2 with the eye, is identifying/always labelling refraction occuring at the boundaries between air/cornea etc. and not just pointing to the four places, you have to be specific that it occurs at the the place where the medium changes. (A HSC Q a few years ago specified this).
Oh a 3D model? aren't you guys doing the bovine eye? thats what we did lol (although I don't remember the experiment because I jigged most of my bio classes) There are heaps of resources on the internet.
EDIT: what LHS said is definitely correct. It will become quite easy when you holistically look at them. Although my favourite was the ear.