[Determination of refractive status in groups by laser (author's transl)].

It was tried to demonstrate the laser-test simultaneously great groups of persons and thus to divide them roughly into prospective emmetropes and different ametropes. For that an interference-phenomenon of laser-light on a screen is used to determine the refractive status. If the head is moved slowly in one direction, myopes register a movement of the interference-pattern in the contrary sense, hyperopes a movement in the same sense, while emmetropes do not recognize a direction of movement. The refractive status of 139 students was investigated. The results of the laser-test with a small group of 24 students were compared with the results of retinoscopia, in the course of which the laser-test proved to be very sensitive. In 86% of the cases laser correction and retinoscopic correction were identical within a variation of +/- 0.25 dpt. All ametropic patients were detected with great certainty. Even negligible, subjectively not perceptible ametropia could be detected. Thus it was shown, that only 60% of those, who have been found to be ametropic by the laser-test, really do need glasses or a better correction. For determination of astigmatism further experiments are necessary.