Mosby's Canadian Practical Nurse (PN) Practice Test

The main idea here is understanding what 20/40 vision means and what helps most at that level. A 20/40 acuity means the person can see at 20 feet what a person with normal vision sees at 40 feet, indicating a refractive error that is typically correctable. Corrective lenses—glasses or contact lenses—adjust how light is focused on the retina, improving clarity of vision. For someone with 20/40 vision, lenses are the primary and most effective aid to restore sharp distance vision and function in daily activities.

Large-print materials are for reading when vision is reduced beyond standard print even with correction, or for those with low vision. Braille is for individuals with little or no usable vision. A referral to an ophthalmologist is a diagnostic step and part of care planning, not an assistive device. So the most appropriate device in this scenario is corrective lenses.