Welch Allyn SureSight Vision Screener Autorefractor - User Manual - Manual (Page 18)

14
Plus or Minus Cylinder Convention
Your SureSight was set at the factory to the Minus Cylinder Convention. If you
wish to change your unit to the plus 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.
Diopter Power Resolution
Your SureSight was set at the factory to display power in 1/4 diopter increments.
If you wish to change to 1/8 diopter increments:
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 third switch (third from
side of SureSight with the handstrap) up towards the bottom of the
SureSight.