[Determination of the axis position of the correcting cylinder by means of a cross cylinder].
D001251:Astigmatism / Q000628:therapy*; D005139:Eyeglasses; D006801:Humans
ASTIGMATISM/therapy; EYEGLASSES
Opredelenie polozheniia osi korrigiruiushchego tsilindra s pomoshch' iu perekreshchennogo tsilindra.