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

A. Assess the client's ability to read a Snellen chart from a distance of 20 feet. The Snellen chart is the standard test for measuring visual acuity. Legal blindness is defined as a visual acuity of 20/200 or worse in the better eye with correction or a visual field of 20 degrees or less. This test provides objective data to support the client’s statement. B. Observe the client's pupillary response to a penlight. Pupillary response assesses neurological function and cranial nerve integrity but does not measure visual acuity or confirm legal blindness. C. Observe the client's eye movements through the cardinal fields of vision. This test evaluates extraocular muscle function and cranial nerves but does not determine the degree of visual impairment. A client can have normal eye movements despite being legally blind. D. Observe the client's optic disc through an ophthalmoscope. Examining the optic disc helps detect conditions such as glaucoma or optic atrophy, but it does not directly measure vision loss or confirm legal blindness.