What is a visual acuity of 20/70 or less in the better eye after the best possible correction commonly referred to as?

The term that refers to a visual acuity of 20/70 or less in the better eye after correction is commonly understood as "Partially Sighted." This classification indicates that an individual has a significant visual impairment that affects their ability to perform daily tasks, even with the best corrective measures.

In this context, partially sighted individuals may still retain some useful vision, which differentiates them from those categorized as "legally blind," who typically have a visual acuity of 20/200 or worse. The "Partially Sighted" designation acknowledges that while these individuals may not have sufficient vision to meet the usual metrics for normal vision, they can often benefit from visual aids or other accommodations to navigate their environment more effectively.

Terms such as "Hyperopia" and "Astigmatism" refer specifically to types of refractive errors affecting vision but do not pertain to classifications of visual impairment in the same way that "partially sighted" does.