As symbols, the Checkered Eye and the white cane both indicate visual impairment.
Most people who use a white cane have severe blindness, and use the cane as a tool for independent travel.
Some people use a white cane as a symbol, strictly to indicate to others that they have some degree of blindness. If a person has useful remaining eyesight, and doesn't need the cane as a tool, they may still choose to carry one to communicate their visual difficulties and increase their visibility in traffic.
People with impaired vision who do not need the white cane as a travel or safety device, may choose to use a Checkered Eye to indicate that their vision is impaired.
The awareness of a person's hidden needs can alleviate confusion, frustration, and embarrassment, for both visually impaired people, and the people with whom they interact.
Please be aware of the existence of this emblem, and have a glance to see if anyone you encounter may be wearing one.