A chicken’s vision is weighted toward the red/orange and away from blue/green. Makes sense when you remember their ancestors were woodland creatures and, then as now, they peck a living by spotting edible seeds and insects in grass and leaves. The downside is the sight of red, red Chicken blood can make a flock go cannibal. In a big flock, little injuries happen and may not be noticed until it is Too Late. It starts with a peck and ends with…everyone eating Mabel alive.
So this guy invented red-tinted chicken specs that effectively make a chicken colorblind. They’re hinged. When the chicken leans forward, the lenses swing away and the bird can see normally. On the ground, where the food is.
Yes, they work. No, you can’t buy them any more. They’re mounted on a chicken’s Beak by inserting a pin through the nostrils. It probably doesn’t hurt, but you know how people are about these things.
These days, they do the same job by beak trimming. A blunt beak isn’t good for plucking feathers (which is usually how a chicken gets the injury that leads to blood that leads to tragedy). Used to be, this was a pretty awful practice. There is feeling in the beak as it gets closer to a chicken’s face. These days, though, they have a neat procedure where they run a laser across the beak of a young bird, which cuts the blood vessels and the tip of the beak later falls off.
Make sure to follow the link and watch the lefthand video (it shows funny chickens in spectacles, not having stuff put through their nostrils).