My prescription has ADD +2.00 for bifocal, but I need to order a reading eyeglass for computer use. How to convert it? Does anybody can help me? Thanks.

It is not that easy. Some people believe that a simple set of numbers for a prescription can be plugged into a formula and somehow a new prescription will be generated. It is best to go to your local Optometrist and fully explain what kind of reading do you want to perform best. There will be a certain amount of positive (convex) lens power that will provide the needed amount of correction at the most comfortable distance for the size of document or book you read most. Also, you must know clearly that the eyeglass is for reading or just for computer use.