Welch Allyn SureSight Vision Screener - User Manual - Manual (Page 21)

17
Results
Reliability Number indicates the number of good readings obtained and their
consistency, based on a 1 to 9 scale (higher numbers are better).
• >6 is typically acceptable ,
• 5 is marginal / repeat the test if possible
• <4 is poor / repetition of the test is necessary
, If the patient did not appear to fixate on the unit during data acquisition, repeat
the test.
S is the sphere, or power of the eye measured in diopters. Negative numbers
indicate myopia (near-sightedness), positive numbers indicate hyperopia (far
-
sightedness).
C is the cylinder, a measure of astigmatism, or irregular focus of the eye.
D is the difference in the mean spherical power between the two eyes (displayed
in child mode only).
* An asterisk on a reading in child mode indicates it is in AAP pre-school referral
range.
A +9.99 or -9.99 indicates a reading outside the unit’s measurement range.
Sphere
Cylinder
Difference
Reliability
Number
Child/Adult
Mode