Wall eyed horse

There's often a few horses wondering around the field that backs on to our flat so I thought I'd see if any of them fancied having their photo taken this afternoon.

This horse came to say see what I was doing and stood out with its bright blue eye which I'm reliably informed by my veterinarian girlfriend is known as 'wall eye'. Wikipedia tells me it is also known as 'glass eye', 'moon eye', 'china eye' or even 'night eye'.