[The use of the labile crossed cylinder (Astikorrekt)].
D000818:Animals; D001251:Astigmatism / Q000175:diagnosis*; D049851:Gastropoda; D006801:Humans; D009885:Ophthalmology / Q000295:instrumentation*
ASTIGMATISM/diagnosis; OPHTHALMOLOGY/apparatus and instruments
Zum Gebrauch des labilen Kreuzzylinders (Astikorrekt).