They differ from blinders as they allowed the bird to see forward whereas blinders do not. They were mass-produced and sold throughout the United States as early as the beginning of the 20th century, chicken eyeglasses were often made from celluloid or aluminum and typically consisted of two oval panels that fit over the upper beak of the chicken. A pin is put through the nostril to-hold the oval pieces in place, different designs were produced that attached to the chickens head in different ways. Some were held in place by a strap, some by small hooks into the nares, due to the piercing of tissue, this last type of design is illegal in some countries. Some versions of the devices had lenses that were semi- or fully transparent whereas others were tinted, other designs were blinders which are opaque and completely prevent forward vision. The intended purposes of chicken eyeglasses were to prevent aggressive pecking, cannibalism, chicken eyeglasses are an alternative to beak trimming, which is the removal of approximately one-third of the beak by a cold or heated blade, or an infrared beam, usually when chicks are 1-day old. This is often effective in reducing pecking injuries, but causes pain and has significant effects on chicken welfare, red-tinted lenses were considered to be effective in reducing internecine pecking because they disguise the color of blood. The firm had added the feature to its glasses in 1939 under the brand name Anti-Pix. This variety of eyeglasses was more complicated than others because the red lenses were fixed to a hinge at the top of the frame and this meant that as the hen lowered its head to feed, the lens swung out giving the hen an unobstructed view of the ground. When the hen raised her head, as she would during aggression, rose-colored contact lenses, rather than eyeglasses, have also been proposed to reduce cannibalism in chickens. A form of eyeglasses was first patented in 1903 by Andrew Jackson, Jr. of Munich, Tennessee. In the U. S. they were available through the mail order company Sears-Roebuck, the eyeglasses are no longer produced by the National Band & Tag Company, but are sought as collectors items. Using chicken eyeglasses was still practiced in 1973, evident by a report in Illinois The Hawk-Eye newspaper that a farmer had 8,000 chickens fitted with the rose-colored variety. One inventor of a form of the proposed legislation in Kansas to require all chickens in the state to be fitted with glasses. On January 16,1955, Sam Nadler of the National Farm Equipment Company of Brooklyn appeared on CBS popular primetime television show, the show was in the format of a guessing game, in which a panel attempted to determine the line of contestants. Show officials listed Mr. Nadlers occupation for the audience as sells eyeglasses for chickens, after the panel was unsuccessful in guessing his occupation, Mr. Nadlers identity was revealed and he stated that his company sold 2–3 million pairs of chicken eyeglasses per year. Whats My Line. s director, Frank Heller said in 1958 that the shows most unusual occupation over its then eight-season run was. the gentleman who makes eye glasses for chickens. Abnormal behaviour of birds in captivity Doggles Overview of discretionary invasive procedures on animals Vent pecking 1947 Paramount Newsreel about chicken glasses Whats Whats My Line
Detail from a 1903 patent filed by Andrew Jackson, Jr.