The test varies slightly between TOC/FOC, but the two I’ve worked for have used a desk based machine which replicated the snellen scale (the wall chart) and the blank one eye hole out etc to test each eye, then have both open. They also test with correction and without.
My eyes are poor, so much so I was worried about the medical. Even corrected vision, although feels okay to me, isn’t perfect. My prescription is quite strong too, which they take in to account.
But I seen that uncorrected must be 3/60 I think I read some where. I’m not totally sure my left eye will get this as opticians said they had my left eye as “count fingers” which is less than 3/60. And didn’t want laser eye treatment however not sure I would be allowed it and still get through medical. I’m trying to think of ways to maybe improve my left eye slightly as with both eyes I see perfect no vision affected at all untill I close my right eye.
I’m not sure on the exact standards, but have attached the RSSB document which lists everything (although it may be measured differently).
