A client states, “I am legally blind.” Which assessment technique should the nurse use to obtain data to support the client's statement?

Choice A reason: Examining the optic disc may reveal structural abnormalities but does not directly assess visual acuity or legal blindness. Choice B reason: Cardinal field testing evaluates extraocular muscle function and cranial nerves, not visual acuity. Choice C reason: The Snellen chart is the standard tool for measuring visual acuity. Legal blindness is defined as visual acuity of 20/200 or worse in the better eye with corrective lenses. Choice D reason: Pupillary response assesses neurological function and light reflexes, not visual acuity.