Eyesight test for driving licence renewal - anyone know the details?

Fogmatic

I have a renewed driving licence on its way in the post, and it'll be marked for the first time as having to wear corrective lenses for driving. This is because one eye on its own can only read less than halfway down the eyesight chart (though the other one can read the whole lot. As can both eyes at once, though I wasn't tested on that). Did my GP interpret whatever the rules are correctly?
I renewed the licence because I've just reached age 70, hence the certificate of fitness to drive.

I'd just like to check that this is right, especially as he seemed not to have seen this form before. Maybe it's been revamped recently (I gather that the regulations in Ireland might have been getting more stringent).
Apart from having to test eyesight, the form was a simple box-ticking exercise (straight 'no's all the way re potential problems), but the GP did make one mistake on it*, and I just wanted to make sure he hasn't also made any mistake with the eyesight test.

Each eye read the same number of lines on the test chart as it always has for me (once he'd managed to find one!) He told me I needed corrective lenses for driving, and ticked the form accordingly.
Another thing I wanted to check was this being the only visual test, which didn't seem strange at the time, as reading a numberplate was the only vision test for my first licence, in the UK (with both eyes at once, I think). I've since learned that eye tests for a first licence in Ireland are more complex than that, making my simple chart test at 70 look not very logical. But perhaps the chart fail just made any further testing irrelevant.

If I was tested correctly, so be it (and if anyone's keen on being a good driver, I am). And I do like to wear my glasses when out and about in the countryside (for seeing distant scenery with more depth, for instance). But the legal requirement would be a nuisance if it arose mistakenly (even more so than the consequent extra paperwork!).

I've since gathered that being able to read about halfway down the chart is considered
acceptable (for a first driving licence, anyway), but I've been unable to find out if that's through each eye or using both.

*The mistake the GP did make was just ticking the wrong group of vehicles, which luckily I noticed in time to simply wait for the next patient to come out and and get it corrected. (It turned out that he should have initialled the correction as well, but luckily the licensing people let it pass, because the change was to a less demanding group, so I didn't have to go back to square one!).