What are the two common types of corrective vision surgeries?

The correct response highlights laser-based surgical techniques, specifically radial keratectomy and laser in situ keratomileusis (LASIK), which are well-known corrective vision surgeries. These procedures work by reshaping the cornea to improve the eye's ability to focus light correctly onto the retina, thereby enhancing vision and reducing the dependency on corrective lenses like glasses or contact lenses.

Radial keratectomy involves making radial cuts in the cornea to flatten it, which can help correct nearsightedness. On the other hand, LASIK employs laser technology to precisely remove corneal tissue, allowing for a more refined correction of a variety of refractive errors, including myopia, hyperopia, and astigmatism.

Other options presented, such as photorefractive keratectomy and cataract surgery, do include significant techniques in vision correction but do not represent the same two common types as requested in the question. Additionally, lens implant surgeries relate more to addressing cataracts than to refractive surgery aimed at correcting vision through corneal reshaping techniques. Therefore, the answer involving radial keratectomy and LASIK correctly identifies two prevalent corrective surgeries utilized for vision improvement.