Originally Posted by
rickair7777
Probably not that simple.
For vision, they are usually more interested in BCVA rather than the underlying condition (unless it can progress rapidly or unpredictably).
In this case, if one eye is 20/20, and you can also see 20/20 with both eyes it should not be a problem to get a 1C with a waiver (they are pretty common for weak vision in one eye, in fact there are airline pilots flying with only one eye).
But ask your AME, he knows best.
I'm talking about the US and the FAA, I'm not familiar with other country's rules.
6/9 is the metric equivalent of a Snellen 20/30. That doesn't meet class 1 standards but it is easily within the range where waivers are given.
Herpes simplex keratitis of that degree is usually controllable by topical medication (eye drops) so if promptly diagnosed and treated it doesn't interfere with flying duties. Not all airlines will accept people with less than 20/20 vision bilaterally though, despite waivers, although the bias against those people is more theoretical than objective.