Can anyone explain this? Eye question?

Question

During the application process, the pilot candidate’s eyes will be tested for both near sightedness and far sightedness.

In terms of distance, the better eye must be at least 6/12 or 6/18 and the other eye 6/18 or 6/30 correctable to at least 6/6 in the better eye and 6/9 in the other eye.

With regards to near sightedness, the candidate will be tested for reading at 30-35 cm and 100 cm. For this examination the individual must have N10 and N24 in the better eye and N10 and N24 in the other eye as well. Their vision must be correctable to N5 and N14 in the better eye and N6 and N18 in the other eye.

*NOTE: The refractive error must not exceed plus or minus 5.00 dioptres (+/- 5.00D) spherical equivalent in either eye. Spherical equivalent is determined by algebraically adding half the cylinder part of the correction to the spherical part of the correction, (cylinder/2) + sphere.

I'm nearsighted and my prescription is -1.75 but what does all the 6/6 and N# requirements mean

Answer 1

That is all metric equivalents to the 20/20  snellen chart you know of.

It all means you are well within the limits, and have nothing to worry about.

Your vision must be correctable to 20/20 in at least 1 eye and no worse than 20/30 in the other. Correctable means with glasses or contacts on .

Answer 2

6/6 and N specify sizes of letters on test charts.

You will be tested with the specified letter size at the specified distance and if you can see it you will meet the requirement.

It is not possible to predict whether you will see them or not based on your glasses prescription; knowing your prescription tells us nothing about how well you see with it.