Rob is correct. In an optical system, DOF is DOF. An image on a sensor or film is either focused or not.
But while the human eye is viewing an image through an optical system, the eye forms part of the optical system. There is another lens (within the eye) and "sensor" (retina) in the mix.
The human eye tries to make a blurry image clear, a process called accommodation
. This ability declines markedly with age.
So the apparent
DoF of a scope is influenced by the individual using it.