Final answer:
Acceptable acuity in multifocals is generally at least 20/40 vision at both near and distance. This level of vision is considered sufficient for most daily activities. The answer to the student's question is B. 20/40 vision at both near and distance.
Step-by-step explanation:
Acceptable acuity in multifocals generally means achieving vision that is functional for both near and distance tasks. It is not always expected to reach perfect 20/20 vision at all ranges, particularly if a person is already experiencing presbyopia or other age-related vision changes. However, most individuals with multifocals should be able to achieve at least 20/40 vision at both near and distance, as this is considered the minimum requirement for most day-to-day activities, including driving. The answer to the student's question is B. 20/40 vision at both near and distance.
Optometrists test visual acuity using various methods, the most common being the Snellen chart, which helps determine if corrective lenses are needed to achieve better vision. When someone has an issue with accommodation, optometrists may prescribe bifocals, progressives, or other types of multifocal lenses to help correct the vision at different distances. However, the power of multifocals required depends on individual needs and may differ based on the level of accommodation and the near point of the individual's vision.