title: A microprocessor-driven one-operator forced-choice preferential looking apparatus.
abstract: Forced-choice preferential looking (FPL) is a behavioural technique for the estimation of visual acuity in preverbal children. We have constructed an electromechanical FPL apparatus controlled by a microprocessor requiring just one operator. Sixty-three babies aged between six weeks and eleven months were evaluated with an overall success rate of 83% in obtaining an acuity measurement. FPL is a practical method for measurement of infant visual acuity in the ophthalmic clinic setting.
mesh_terms: D001524:Behavioral Medicine / Q000379:methods; D005069:Evaluation Studies as Topic; D006801:Humans; D007223:Infant; D008838:Microcomputers; D014787:Vision Tests / Q000295:instrumentation* / Q000379:methods; D014792:Visual Acuity