The phrase encompasses decorative ocular prosthetics designed for the holiday that, due to their aesthetic nature, often evoke feelings of fear or unease in observers. An example is a lens that completely blacks out the sclera of the eye, creating a visually striking and unsettling effect.
The significance of these items lies in their ability to enhance costumes and create dramatic visual transformations. Historically, theatrical makeup and accessories have played a vital role in conveying character and mood; these lenses represent a modern extension of that tradition, allowing for a heightened sense of realism and impact. They offer a potent means of self-expression and immersion in the spirit of the holiday.