Subjective testing for astigmatism, accomplished by dials of the type made popular by Lancaster1 and Regan,2 is widely practiced. However, considerable effort is required in the selection of the proper axis on dial 1 and in the adjustment of dial 2 to that axis. Hence it seems appropriate to present a suitable method whereby these maneuvers may be accomplished by remote control.
Only recently, Weston3 described a method which is in part very similar to such a procedure. However, he used only a single astigmatic cross. Other types have been employed, utilizing principally mechanical connections.
The system to be presented consists of two large dials, each of which is constructed on a 30 inch (76 cm.) square, of thin aluminun, and the control box. Dial 1 consists of 1/4 inch (6 mm.) black tapes, each 10 inches (25 cm.) long, arranged radially at 10 degree intervals
MILLS DA. A SYSTEM OF REMOTE CONTROL APPLIED TO ASTIGMATIC DIALS. Arch Ophthalmol. 1950;43(5):912-913. doi:10.1001/archopht.1950.00910010927018