 Although Ophthalmologists and Orthoptists believe that exercises can improve binocular vision control, they believe it does not purely improve monocular visual acuity such as that in amblyopia (rather, occlusion is the therapy of choice), change a person's refractive error.It is probable that they do not change the accommodative/convergence ratio nor change the amplitude of accommodation to postpone or delay presbyopia.It has been considered that they are unlikely to a person to develop the ability for stereopsis; nonetheless recent experimental investigations into dedicated perceptual learning exercises, inspired by Barry's recovery of stereopsis, have shown some promise.