Kay iSight Test Professional is an iPhone app designed for measuring and saving near and distant visual acuity in individuals ranging from 18 months old to adults. The app provides a user-friendly interface with a selection of presentations and test distances, catering to a wide range of users. A notable feature of this app is the ability to test vision on external screens or remote devices, now available on the iPad.

Featuring Sloan letters, Kay Picture optotypes, unique reading texts, and fixation targets, Kay iSight Test Professional offers a comprehensive vision testing experience. Users can choose between letters and pictures for testing, view results in LogMAR notation, metric or imperial Snellen, or Decimal, and save visual acuity data for each eye individually.