This resource from Lenstore provides an interactive guide to the human eye.
It takes you on a journey through the eye, with detailed explanations for each of the different parts. Rather than the usual cross-section view, you can explore the eye in first-person, zooming in through the pupil all the way to the optic nerve.
The pop up labels give a short description of each part, with a link to find out more.
This would be very useful for science teachers when talking about the eye, combined with a more usual cross-section diagram, such as this one.
You might also enjoy this resource : http://www.visiondirect.co.uk/the-human-eye
See more at www.lenstore.co.uk/how-your-eyes-work