An Over-Refraction Program for the Tl 59 Card-Programmable Calculator
- 1 July 1979
- journal article
- research article
- Published by Wolters Kluwer Health in Optometry and Vision Science
- Vol. 56 (7) , 460-464
- https://doi.org/10.1097/00006324-197907000-00009
Abstract
Over-refraction provides a powerful method for the refractive examination of the aphakic or highly ametropic patient. Practical difficulties in mathematical or graphical combination of over-refraction and original spherocylinders have tended to limit the clinical use of over-refraction methods. Inexpensive programmable calculators render over-refraction clinically practical. An over-refraction program for the Texas Instruments Tl-59 Card-Programmable Calculator is presented. Program running time, exclusive of data entry and readout, is under 15 s.This publication has 0 references indexed in Scilit: