Put another way, suppose you have trouble seeing objects at a distance and you can only see out to 20 ft what a person with normal vision can see out to 200 feet, then you have 20/200 vision. The 6/6 terminology is more commonly used in Europe and Australia, and represents the distance in metres.
1 SID, also s.i.d., is a veterinary abbreviation meaning to give medication once a day. 2  Medical professionals for humans instead use the term qd (an abbreviation for quaque die). 3  However, that term can be easily mistaken with the term qid (an abbreviation for quarter in die), which means four times a day.
Fluoxetine (Sarafem) is usually taken once a day, either every day of the month or on certain days of the month. Take fluoxetine at around the same time(s) every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand.