BE PERSISTENT. What should you do if you have trouble prying your prescription out of your doctor''s hands? Your state attorney general''s office should be able to tell you whether your state requires doctors to give out prescriptions. If yours doesn''t, try reassuring your doctor that you will not neglect necessary follow-up visits, or ask him or her to match prices you''ve found at an online or mail-order source.When comparing prices, be sure to factor in any shipping charges that add to your mail-order costs. And ask what a discounter''s policy is on replacing damaged or missing lenses; many doctors doctorofoptometry replace them free. Also check the expiration date when you get your lenses to make sure they haven''t expired

Simultaneous lenses bring distant and near objects into focus at the same time. The center of the lens corrects distance vision; the outer part corrects near vision. * Segmented lenses correct distance vision in the top half and near vision in the bottom half.Monovision An alternative to bifocal contacts, monovision lenses correct distance vision in one eye and near vision in the other. Modified monovision doctorofoptometry allows wearers to put a bifocal lens in one eye and a single-vision lens in the other.Implants Designed for mild nearsightedness, KeraVision Intacs are placed in the periphery of the cornea by an ophthalmic surgeon. Made of polymer, a type of hard plastic, they require no maintenance and can be surgically removed. The outpatient procedure has a 97-percent success rate of 20/40 vision or better.

Originally, doctorofoptometry hard contact were made of a material called PMMA. Although still available, the more common types of contact are listed below:Rigid gas-permeable (RGP) daily-wear lenses are made of plastic doctorofoptometry that does not doctorofoptometry absorb water but allows oxygen to get from the doctorofoptometry atmosphere to the cornea. (This is important because the cornea has no blood supply and needs to get its oxygen from the atmosphere through the film of tears doctorofoptometry that moves beneath the lens.) They must be removed and cleaned each night. Rigid gas-permeable (RGP) extended-wear lenses doctorofoptometry are made from plastic that also does not absorb water but is more permeable to oxygen than the plastic used for daily-wear lenses.