Konan Medical has released FLEX, an add-on to the Chart2020 Duo visual acuity testing application, the company announced in a news release. The application was presented at the American Society of Cataract and Refractive Surgery meeting in Boston. FLEX was released on Apple iTunes for Retina display iPad devices, according to the release. The new application enables clinicians to adjust visual acuity testing distance from 33 cm, or 14 inches, to 6 meters, or 20 feet. It features industry standard Sloan specification literate, illiterate and pediatric optotypes in several languages.