Welch Allyn SureSight Vision Screener - User Manual - Manual (Page 25)

21
Plus or Minus Cylinder Convention
Different eye care providers express astigmatism in different forms.
Ophthalmologists typically express it in plus form, which is how the Suresight has
been pre-set. Optometrists typically use the minus cylinder convention. If you
wish to change your unit to the minus convention:
1) Open the battery cover located on the underside of the unit by sliding it in the
direction indicated by the arrow and lift up.
2) Rotate the lever holding the battery in and lift the battery from its
compartment.
3) View the DIP switches inside the battery compartment located on the button
side of the unit.
4) Using tweezers or another appropriate tool, pull the first switch (located on
the side of the unit with the handstrap) up towards the bottom of the
SureSight.
Updating SureSight Software
If it is necessary or desired to update the unit software:
1) Connect the cable supplied with the software disk to a PC (IBM compatible,
486 processor, Windows 3.1 or higher) RS232 port.
2) Connect the other end of the cable to the RS232 port on the bottom of the
SureSight (when SureSight is powered down).
3) Insert floppy disk into PC’s 3.5” floppy disk drive.
4) Run a:\setup to begin update.
5) Follow the prompts displayed on the PC.
6) View the DIP switches inside the battery compartment located on the button
side of the unit.
7) Using tweezers or another appropriate tool, pull the third switch (third from
side of SureSight with the handstrap) up towards the bottom of the
SureSight.