I presume DVLA requested a Visual Field Test - which is quite common for people who have glaucoma.
Here is a quote from Specsavers FAQ:
The visual field test for DVLA requirements is caller the Esterman test and is done with both eyes open, so even if you have got a field defect in one eye only, it is unlucky to affect your overall visual field. Also it is possible to miss some points and still be ok as long as there is sufficient horizontall and vertical range, that is usually a little less than the normal eye can achieve. Each visual field test result is considered individually by the DVLA.
It is possible for a person to pass one of these tests within a short time of failing one and people can and do have varying results with this type of test. This is probably why Specsavers offered a re-test. DVLA will only pay for one test, which is why the second test offered would have been at your relatives cost.
Edited by Auristocrat on 02/01/2015 at 15:56
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