Also assuming you're fairly young...I would ask the doc (or your eye doc) to verify that you correct to slightly better than 20/20 (say 20/17 or 20/15)...you probably do. That way you know you'll have a little margin as you age.

when a pilot can have a drug test ?

Whenever his employee number comes up on his employer’s roulette wheel.

Or if you show up for work stoned and with enough burgers and milk shakes for everyone, but they are all really just for you.

i just get my medical certificate First class by medical examiner . but in the paper i didnt find where is the issue date .where can i find or know

hello , i just visit an aviation examiner and get the paper for medical certificate first class. but they didnt mention when the issue date where can i find it .thanks

What day did you go? That is the date it was issued. In case you have forgotten when you went the certificate has a block, "Date of Examination."