METHOD OF AND DEVICE FOR DETERMINING THE STATE OF REFRACTION OF A HUMAN EYE

摘要

For determining the state of refraction of a human eye there is first effected automatically a coarse balancing operation and subsequently a fine balancing operation is performed manually with the same apparatus. Said apparatus may be a phoropter or another known device for determining the state of refraction of a human eye. A refractometer attachment is connected to said device and effects automatically the objective coarse balancing operation. The fine balancing operation of said device is performed manually after switching off said attachment.