If you are squeamish, you might want to look away. The first picture is of the corpora nigra in a pony's eye. This amazing feature of the horse's eye is apparently designed to act rather like a baseball cap in protecting the horse's eye from bright light. It appears at the very top of the pupil and looks like clouds. However, sometimes it can be enlarged by cysts which can affect the horse's eyesight.
The second shows a very clever skin graft onto the lens of Zak's eye (following a puncture injury) which is still connected by blood vessels to his eyelid in order to keep it alive. In the meantime another client's horse has unfortunately had to have his eye removed following the discovery of cancer. Horses seem to cope extremely well with one eye considering they are meant to have almost 360 degree vision.
