The treatment of amblyopia with the Campbell stimulator is based on the concept of active and controlled stimulation of the patient’s eye. Rotating stripes provide simple stimuli which stimulate the retina in terms of space and location.
The research shows that the cells of the cortex which are responsible for seeing pictures react best to moving lines of a certain width. The stimulator is designed so as to activate cells of the cortex and also the entire visual system.
Campbell used in his apparatus tests with high contrasting stripes, which rotate on the plate very slowly (one full rotation per minute)
During a task a child observes the stripes which are rotating very slowly while making different drawings on the glass or outlining the pictures. This facilitates their concentration on the stripes and trains eye and hand coordination at the same time. As soon as the visual acuity starts to improve the width of the stripes used for the task should be decreased