Small cog is correct, not everything written by everyone on Internet forums is sensible or makes sense.
In addition; if you don't meet 6/6 with correction you won't get a Class 1.
And should you only be able to get to 6/6 by trying hard you may want to ask yourself whether it is wise to invest the best part of £80k to get the CPL/IR only to have to worry about losing it every year due to any minor deterioration of your eyesight.