We have a visual acuity test and a peripheral vision test.
I do not think one can extrapolate safety figures from the stringency or otherwise of medical test assessments.
My view is: would you wish to have someone untested for their eyesight (where eyesight problems are more likely than the general population) or for their ability to see out of the corner of their eyes (peripheral vision or fields as it is called) allowed to drive unrestricted ?
I think the answer is obvious. I would always vote for the more strict testing for my sake and everyone else on the road or near it.
Any visual issue for me during a driver's license assessment has to be referred to an ophthalmologist for further assessment and certification.
And it is sadly not unknown for people with eyesight/field problems whether from diabetes or not to try to bluff or threaten the examining doctor into letting them pass.
I have already discussed the issue for high BSLs above and note
@Chowie's post.