The Collyrium is a complement to correcting of the eye. The duration of the treatment is flexible and is usually 10 months. The active ingredient in the eye drops is Inosine Monophosphate, which helps create a clearer image on the retina by having an immediate action of the lens of the eye. It is used at a frequency of 1 to 3 times a day 6 days on 7, morning afternoon and early evening. The action of the drops last up to 4 hrs. The usage time frame, once opened is one month. This product is not sold with a doctor's prescription. To find out more about the eye drops follow this link.