Final answer:
There is no specific data provided for adults aged 80 and older, but it is well-known that visual impairments become more common with age.
Step-by-step explanation:
According to the information provided, the question asks what percent of adults aged 80 and older have a visual impairment. Unfortunately, there is no data specific to adults aged 80 and older in the given information. However, it is well-known that visual impairments become more common with age, and as the age group increases, the likelihood of visual impairments also increases. Therefore, it is safe to assume that a significant percentage of adults aged 80 and older may have a visual impairment, potentially above 60 percent. However, without specific data, it is not possible to provide an exact percentage.