[The preferential looking technic: material and procedure for testing baby vision].
The preferential looking technique, together with a cover test, retinoscopy and a fundus examination is done in a hospital setting for screening and follow-up of visual deficiencies in infants between 3 and 12 months of age. A series of granting from .375 to 18 cycles per degree are generated by slides, paired with a matched mean luminance uniform area. The child's preferred gaze orientation is determined by an orthoptist unaware of the randomized side of the granting, from a picture of the infant displayed on a closed-circuit television. The baby is gratified after each positive trial. The finest grating toward which the baby systematically orients its gaze is a behavioral estimate of its spatial resolution ability. Binocular and monocular testing are performed in at least 15 minutes. Details of equipment and procedure are described.
D004056:Differential Threshold; D005403:Fixation, Ocular; D005556:Form Perception; D006801:Humans; D007223:Infant; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation / Q000295:instrumentation; D013690:Television; D013997:Time Factors; D014786:Vision Disorders / Q000175:diagnosis; D014787:Vision Tests / Q000295:instrumentation / Q000379:methods*; D014792:Visual Acuity; D014796:Visual Perception / Q000502:physiology
La technique du regard préférentiel: matériel et procédure de bébé vision.