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43 Vis ua l field tes ts
E l e k t r o n E y e T e c h n o l o g y 2 0 1 8
3 .2 .4 .2 Stan dard Dev iation
The Pattern Standard Deviation of the defect values is a measure of their variability. Large
values are indicative of localised scotoma. This global index can be used to monitor progression
where increases in the index indicate a deepening or enlargement of localised loss.
The index is in sen sitiv e to overall shifts in sensitivity that may occur due to cataract etc.
The index is sen sitiv e to lens rim artefacts and droopy lids.
A P-value is given when the probability of the SD value coming from a normal patient is below
10% (possible outputs are <10%; <5%; <2%; <1%; <0.5%). When it is above 10% then the
message
W ith in N orm al L im its will be displayed.
Th e f i g u r e a b o ve s h o w s t h e g l o b a l i n d i ce s a s t h e y a p p e a r o n t h e s t a n d a r d p r i n t
o u t .
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