How is Qisas done when equal retaliation is not possible?

For example, suppose that a tooth-less person breaks the teeth of another, or an eye-less person pokes out another's eye, or a woman cuts off a man's penis, or a man cuts off a woman's breasts etc. Like-for-like retaliation is not possible, so what happens if the victim demands Qisas? My guess is that substitutions are defined or the victim has to settle for monetary compensation only.