There are a number of applications and training protocols that involve training a person with visual field loss to scan into their blind area with compensatory head or eye movements.

Training exercises have constraints. Finding numbers in order along a known path, seeking out a known light on a screen of known dimensions. Patients will improve at these exercises over time as they learn the boundaries of the constraints and how to operate within them. They may even “level up” to more challenging exercises with different constraints. But when they leave the training arena, they go from a constrained training environment into a life, which is completely free of constraints.

Much like being good at a car racing video game does not translate into success on the road as a driver, many exercises do not translate to success in an unconstrained real life environment. In an uncontrolled environment (like most of life), there is scant evidence that a person with visual field loss will make a dramatic effort to seek objects of interest outside of their detection area.