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US20060170864A1   [0010]  [0010]  [0010]  [0015]  [0017] 
DE102013000295A1   [0011] 
US20030053027A1   [0012]  [0015]  [0016] 
DE4131799A1   [0013] 
WO2016045866A1   [0014] 
DE102014113682   [0053] 

BMJ 2011   [0008] 
Optom. Vis. Sci.   [0008] 
Measurement of astigmatism by automated infrared photoretinoscopy   [0044] 
Optometry and Vision Science   [0073] 
Wörterbuch der Optometrie   [0075]