Shark corneas are surprisingly similar to human corneas, and have been used in transplants

An owl can detect a mouse more than 150 feet away while hunting at night

Some fish and amphibians have a 3rd pseudo-eye that is used for sleep and hormone cycles

Camels have three eyelids to protect their eyes from blowing sand in the desert

Birds can see UV and near-UV light

Goats have rectangular pupils to give them a wider field of vision for detecting predators

Scallops do not have brains to process images but have around 200 "eyes" that detect light/shadows and help avoid predators

Owls do not have muscles to move their eyes, which has led to them evolving necks that can turn 270° in either direction

A dragonfly has 30,000 lenses in its eyes giving it superb motion detecting and making it very difficult for predators to kill 

The largest eye on the planet belongs to the Colossal Squid and it measures a massive 27cm(~11in) in diameter

The eyes of a chameleon function independently from each other, allowing the chameleon to look in two wildly different directions at once.

The mantis shrimp has four times as many color receptors as the human eye and some can see into the UV range

An ant appears to have only two eyes, but they are actually two compound eyes with many smaller eyes bunched together

Eagles have 1 million light-sensitive cells per square millimeter of the retina - humans have a fifth of that on average at ~200 thousand

Horses and zebras have sideways-pointing eyes, allowing them to see everything to their sides and even somewhat behind them. However, this means that they have a blind spot right in front of their noses!