elektron eye technology Henson 9000, Manual, Page: 60 / 155

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Hens o n 9000 Per imeter Us er M a nua l
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. 3
E s ter ma n Bino cula r Dr iving tes ts
The Henson 9000 provides two visual field tests for Driving. The first, Group 1, meets the
standard set by the UK Driver and Vehicles Licensing Agency (DVLA) for drivers of cars and
motorcycles. The second, Group 2, is for drivers of HGV and public service vehicles.
Both Driving' tests are binocular with a fixed intensity stimulus (10dB, 318.4cd/m
2
) with the
Goldmann equivalent background intensity of 10cd/m
2
.
When performing a Driving test the patient's forehead should be placed in the middle of the
head rest and they should be allowed to turn their head to follow the fixation point.
The Driving' tests are single stimulus tests and the patient responds to each seen presentation
by pressing a
response button.
The Driving' tests incorporate a number of false positive and false negative catch trials .
These are used to give a measure of reliability.
T o get m ore h elp on a test sc reen item c lic k over th e item in th e im age below .
63
80
71