Survey reports on adults with difficulty seeing despite wearing glasses in the United States

This 2018 survey report provides observational, descriptive data on visual difficulty among US adults. The study population included adults aged 18 years and older across the United States. The primary outcome was the age-adjusted percentage of adults who reported having difficulty seeing even when wearing glasses. No specific intervention, exposure, or comparator was reported.

The main result for the age-adjusted percentage of adults with this difficulty was not reported in the provided data. No secondary outcomes, effect sizes, absolute numbers, or statistical measures like p-values or confidence intervals were available. The follow-up duration and sample size were also not reported.

Safety and tolerability information, including adverse events or discontinuations, was not reported. The report did not list specific study limitations, and funding sources or conflicts of interest were not disclosed. As a descriptive survey, this report cannot establish causality, assess trends over time, or evaluate the effectiveness of any specific corrective measures. Its practice relevance is limited to providing a basic, self-reported estimate of a specific visual impairment category within the national population.