The effects above are caused by light scattering through RK incisions. In normal light, the pupil is smaller than the zone which contains the incisions. However, at night the size of the pupil enlarges, with the results that incisions now fall inside the patients visual field. In other words, the patient is looking through the incisions.
Some subjects have incisions that cross into the visual field during the day, as well.
This is but one of a host of guaranteed surgically-induced additions to your night life. We lived it for years and questioned our own sanity until we found the science to back us up. Much of the proof was published in ophthalmic journals years before our surgeries, but the surgeons never kept up with the literature. So they kept doing surgeries even after the science to stop these disasters was published. Surgical Eyes does not provide medical or legal advice.