Portable auto refractometers are very light and compact instruments; this favors a correct balance during their use. By tilting the instrument 60° or more, the “supine position” mode is automatically entered when making a measurement on a patient who is lying down.
For inexperienced or uncooperative patients such as children, a “sound” function has been added that serves to calm the patient and capture his attention.
The mobile pediatric auto refractometer measures simultaneously sphere, cylinder, axis, direction of gaze and pupil diameter of both eyes (binocular) with narrow pupil (miosis). From these measured values gaze symmetry and interpupillary distance is calculated.