Kanamycin can be harmful to the kidneys, and these effects are increased when it is used together with other medicines that can harm the kidneys. Before using kanamycin, tell your doctor if you are also using: any other type of antibiotic; lithium (Lithobid); a diuretic (water pill); methotrexate (Rheumatrex, Trexall);
Temple size: a three-digit number in the 120 - 150 range The eye size is the most important number to pay attention to. Depending on the style of frames you choose, you can go up or down by one and still find a decent fit.
The first sign that you may need multifocal contact lenses is if your prescription for glasses has numbers in the ADD column. Numbers in this column indicate that you are presbyopic to some extent. Although there is no set limit to what the ADD number can be, it usually ranges between +0.75 to +2.50. The higher your ADD number is, the more you stand to benefit from multifocal contact lenses. But more importantly than the ADD number, is how bothered you are by your vision up close.