A new test has been devised to use in cases of refraction in which retinoscopy or astigmatic dial tests are unsatisfactory. An exact plan of cross cylinder testing is done to "scan" the principal meridians. The results are consolidated to indicate the approximate axis of astigmatism. The test is based on and conforms to computer methods.
Schwarting BH. Cross Cylinder Scan Test for Astigmatism: A Computer Approach. Arch Ophthalmol. 1969;82(3):330–331. doi:10.1001/archopht.1969.00990020332006
Coronavirus Resource Center
Customize your JAMA Network experience by selecting one or more topics from the list below.
Create a personal account or sign in to: