One of the most fascinating phenomena in stereopsis is the profound hysteresis effect reported by Fender and Julesz (1967). in which the depth percept persisted with increasing disparity long past the point at which depth was recovered with decreasing disparity. To control retinal disparity without vergence eye movements. they stabilized the stimuli on the retinas with an eye tracker. https://www.mamapaisa.com/product-category/wrinkle-serum/