These two adjustments in the contact lens are very distinct, with a sharp line between them. Even though they may sound hard to use, most people find that they are easy use with a little bit of practice. One type of bifocal lens is the aspheric lens, which have a more gradual change of focus. Both power are in the central area of the pupil, and similar to the concentric lens, your eye will immediately adjust to these lenses and decide on the focus that is best to use. Even though you may have got in some practice with your doctor during your fitting exam, you ll find things to be totally different once you step in front of your mirror at home and try to do it by yourself. The first thing you ll notice is that it can be tricky to put your contacts in. If you are putting them in for the first time, it can be a little tricky getting them in your eye. Keep in mind, you also need to visit your eye doctor on your regular appointments, as your eye examinations are still very important - even though your contact lenses may not affect you or bother you at all. Even though most extended wear contact lenses aren t high in price, you should still look for the best deals. Hydraclear is a break through in contact lens technology, perfect for those who have problems with their lenses drying out. This technology is considered to be among the best - and ideal for anyone who wants the best for their eyes. Hydraclear is a rich moisture type element that is found throughout the exterior and interior of Acuvue advance contact lenses, helping to give them a soft, silky feel. If you wear GP lenses or looking to wear them, you ll need to keep a re-wetting solution or saline drops with you just in case they start to get dry. Anytime your eyes feel dry, you can use the drops to moisten your eyes back up, and keep your contacts comfortable. Re-wetting drops are normal to use, even with soft lenses. They are small, plastic shaped discs that are made to correct eyesight problems like nearsightedness, astigmatism, farsightedness, and other problems. Contact lenses are also used by those who have had cataract surgery, as they can help the eyes to heal a bit faster. Contacts are used in the eye, where they will float above a sea of tears that rest in front of the cornea.