OM t of c.iii - Vision Research Coordinating Center - Washington ...

1/1/2005 Chapter 8 Corneal Curvature and Topography page 8-11
The EyeSys system is an alternative means of collecting videokeratography data
for clinics not equipped with a TMS unit. It is currently utilized at the University of
Illinois-Chicago, Northeastern Eye Institute, the University of Missouri-St Louis and
Southern California College of Optometry. Data are stored at each site.
Various hardware and software configurations are being used by institutions
with EyeSys instruments. Hardware may be either System 2000 or EyeSys Model 2
units. Software may vary from Windows ver. 2.11 W to Windows 95 System 2000
version 3.x. Protocols for Participating Clinic configuration variations are listed below.
Follow the version appropriate for your institution.
8.5.1 System 2000 Hardware and Software Version 3.x Protocol and Calibration
(Northeastern Eye Institute, University of Missouri at St. Louis).
Perform this calibration protocol weekly:
(1) From Main Menu, click System Utilities
(2) Place calibration object on hole in center of chin rest, and raise the chin rest
until you see a small hole in the stem.
(3) Click on Calibration Button.
(4) Click “Verify Calibration”.
(5) Follow the instructions on the screen, and click “Continue”.
(6) Align the 55.06 D calibration sphere, and press the acquisition button on the
joystick.
(7) The calibration “Verification Rings Located” screen should appear. Verify that
red and yellow rings alternate.
(8) If the rings look OK, click on “ACCEPT”.
(9) Observe the color map. The values should be within 0.13 D (± 1 SD) over all
points on the surface, if this occurs, then press “Done”, and the system does not need to
be calibrated
(10) If the system is not within curvature values, preceed to
calibration below:
To calibrate the instrument: