A technique is presented for the improvement of visual acuity by means of the correction of refractive errors, using adaptive optics controlled by electromyographic signals. It is based on a model that is biologically inspired by the physiological mechanisms of stenopeic ocular occlusion to obtain control signals. To demonstrate the viability of this concept, two different bio-feedback systems were developed to correct refractive errors of the first order of approach. In a first phase, the ability to control the focus on a camera that recorded a reference image was evaluated by electromyographic signals. Based on the results obtained, another bio-feedback system was developed to control an adaptable lens of adjustable optical power from -10 to +10 diopters, electronically driven. Preliminary results are shown with subjects with normal vision and with subjects with ocular refractive errors. Experiments based on Snellen test were performed to evaluate the improvement of visual acuity, where corrected visual acuity of 20/20 was obtained in more than 85% of cases. Likewise, it was evidenced that with the proposed model, users quickly adapt to the control scheme developed.