Well i'm not 100% sure, but:
Initial:
http://www.caa.co.uk/docs/49/SRG_MED...%5B2189%5D.pdf
Originally Posted by first paragraph of that CAA document
Astigmatism must not exceed 2.00 dioptres.
and then the 'Revalidation and Renewal of JAR Medical Certificates' page on the CAA website shows:
http://www.caa.co.uk/default.aspx?ca...=90&pageid=531
JAR Class 1
The initial refractive error (correction) limit is +5/-6 dioptres. There is no myopic limit for revalidation/renewal. The astigmatism (distortion) and anisometropia (difference between the eyes) initial limits are 2 dioptres, but there are no limits for revalidation/renewal.
NOTE: contact lenses must be worn if the anisometropia exceeds 3 dioptres.
So....
