In 2003, the lab of Human Computer Interaction and Health Care Informatics at the Georgia Institute of Technology conducted empirical research on the performance of patients with Diabetic Retinopathy....

In 2003, the lab of Human Computer Interaction and Health Care Informatics at the Georgia Institute of Technology conducted empirical research on the performance of patients with Diabetic Retinopathy. The experiment included 29 participants placed either in the control group (without Diabetic Retinopathy) or the treatment group (with Diabetic Retinopathy). The visual acuity data of all participants are listed below. Normal visual acuity is 20120, and 20160 means a person sees at 20 feet what a normal person sees at 60 feet.

The data of five participants were excluded from the table due to their failure to meet the requirement of the experiment, so 24 participants are counted in all. In order to verify if the data can represent the visual acuity of the general population, a 90% upper tolerance bound for 80% of the population is calculated.