You can begin the process once you have in your hands the prescription for your contact lenses you can start the selection process. The selection part of contact lenses is surely the most exciting one if you are a shopping freak. The available range is so vast that you would love to have opted for contacts. But this makes your job none too simple as you try hard to narrow down your choice. Well then, you should get to know the various criteria to narrow down your choice and choose the best one by the method of elimination. You can divide contact lenses into several main categories This kind of break up is best done based on several criteria like their material of construction meaning what they're made of, replacement frequency or how often you need to change them, and Usage or whether you can sleep in them. With these issues in mind you will get to choose the contacts that best suit your needs and wants.The basic materials with which contact lenses are made up are derived from different types of plastic.

By nomenclature however contacts can be divided into two chief groups:?soft ?(RGP lenses) now called GP lenses). Soft contact lenses contain from 25% to 79% water. These are known to be very easy for the eye to adapt to. This is why you find that people who are newbie tend to be very comfortable with soft contacts. These are lesser in upfront cost as compared to RGPs. Rigid gas permeable contact lenses however comparatively take much longer for your eyes to get adapted to them. RGPs have a longer life than soft contacts. Their durability is higher with a higher resistance to deposit buildup. This higher life span makes the RGPs to be less expensive in the overall analysis even if you have to definitely pay much higher upfront for them. RGPs are qualitatively also superior from sharper image formation thus offering clearer vision than soft contacts.Thus the important thing that you should keep in mind is that you can take your decision for either lower upfront price to buy soft contacts or for a higher upfront price to buy RGP. You will have to throw off your soft contacts much sooner than the RGP and buy a new one. The time by which you have to replace the contacts is called as replacement schedule.