When people need a support cane to provide physical support, and also need a long cane to find out what's on the ground ahead of them because they can't see well enough, they use two canes -- one for support, and one to reach ahead and find out if there are any hazards (what I call a "probing" cane). Although it may seem awkward, most people are able to quickly learn how to move the canes correctly.
This woman lives in Maryland, and has been using two canes to travel for many years. With one hand, she moves the white "probing" cane in an arc in front of her, in rhythm with her feet, just as people who use one long ("probing") cane do.
With her other hand, she moves a support cane the same way that people who use a support cane do.
Techniques for going up and down stairs with both canes should be developed with the physical therapist and O&M specialist together with the client. Some people hold both canes in one hand while holding the rail with the other. Below, this woman shows how she does it. [grateful appreciation to Sue Boaz for being photographed]
These photos show two men who live in South Africa. They each use one cane for support, and one cane to probe ahead of them. The probing cane has a special tip, the "bundu basher," designed to travel in rural areas.
In the pictures below, one of the men is following a fence to find the opening into his church. He supports himself with a cane in his right hand, and his left hand uses a long cane to search ahead for the end of the fence.