Control of study variables.
P N
PN
Arnold
D006801:Humans; D007910:Lenses, Intraocular; D008027:Light; D055095:Optics and Photonics; D011474:Prosthesis Design; D012107:Research Design; D012542:Scattering, Radiation; D014785:Vision, Ocular / Q000528:radiation effects