Lowdarzz wrote:

It's also interesting that Davros is referred to as a Kaled despite his radically different appearance. The fact that he is confined to a chair and has the use of only one arm suggests that he was involved in some king of accident.
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The implication is supposed to be that Davros was once a human-looking Kaled like the rest, but whatever accident put him in the chair and took away his arm also left his face scarred and charred with sunken, unusable eyes (hence the electronic eye).