My left eye condition is -2.75 dioptres with -0.50 astigmatism. I have read that the sight defect should not exceed 3.0 dioptres: now my question is does it count -2.75 - 0.50 = -3.25 and therefore I would not pass the Initial Class 1?
Let's see. The medical AMC says: (med.b.070)
(d) (1) (ii) myopia not exceeding -6 dioptres
(d) (1) (iii) astigmatism not exceeding 2 dioptres
So there's no problem for you in that regard. However, (d)(5) says that since your correction is between -3 and -6 dioptres, you need to have 5 yearly checkups by an eye specialist.