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Key points

• ASTEROID stands for Accurate stereotest for mobile device.
• The aim was to develop a stereotest that addresses some of the concerns of existing tests.
• Real depth tests, such as the Frisby, suffer from monocular cues if the patient moves.
• Coarse (such as the Titmus) and fine (such as the TNO random dot) stereotests require the use of spectacles or visors and some fade with time.
• All existing tests require a fixed working distance.
• ASTEROID uses parallax barrier technology which provides a 3D image on screen without the need for spectacles or visors, offers no monocular cues and will not fade over time.
• The inbuilt camera allows instant image adjustment to compensate for any variation in working distances.
• Clinical trials show improved compliance from children and results compare well with random dot testing.