Clear view test mark indicator for eye testing - has test mark selector with selection keys operated by sequential selection of test marks

摘要

An indicator (4) displays the clear view test marks selected in a predetermined position. A specifying unit specifies selected key-mark combinations from a test mark selector key and a clear view test mark. An input unit is provided for the data representing the specified clear view test marks, which are stored in memory (11). A positioning device positions a requisite optical appts. in the test window of a refractor (3) corresp. to a signal produced by the test mark selector. A second memory stores a program for control of the operation and evolution of the reading of data in the memory and overwriting of data into the memory. USE/ADVANTAGE - For opticians, simplifies control operation.