Since the user does not have sensation in his hands it is extra important for him to use oven gloves that cover the entire hand. If he uses ordinary square pot holders it is easy for a finger to be left unprotected and be burned without him feeling it.
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Nyttadesign, www.nyttadesign.com (last checked July 2017) sells an oven glove that is extra long and even protects the forearm. The glove is flexible and has a rubber-coated print on the palm that provides a good grip (see photo 2).
This tip is from 2008