Wavefront sensing and adaptive optics, techniques developed from astronomy, have made their way to the ophthalmology practice. Correcting the aberrations of the eye has allowed unprecedented resolution to resolve fine structure in the human retina. On the other hand, wavefront sensing has become a ubiquitous technology to assess the optical quality of the eye and advanced refraction. Visual simulators, based on adaptive optics, allow patients to preview the world with prospective corrections and select the contact lenses, intraocular lenses or corneal refractive surgery pattern that best fits their visual function and perceptual preference