From: utzoo!decvax!ucbvax!CAD:tektronix!tekid!david Newsgroups: net.med Title: RE: Contacts? Help! Article-I.D.: tekid.832 Posted: Tue Feb 8 16:30:03 1983 Received: Fri Feb 11 08:01:11 1983 I have just started wearing ext. wear lenses after 5 years of eye wear. I believe the make is Hydrocurve or something like that. During an eye exam my doctor showed me a leaflet on a new lens. The name escapes me now but the model number is 70 (seventy). The following table shows a comparison of the Hydrocurve, Permalens, and the XXX70. % water oxygen tear strength permeability Permalens 70 14.5 1.8 Hydrocurve 55 17.5 8.5 xx70 70 22.5 18.0 My doctors unwillingness to fit Permalens to first time users was the extreme flimsiness of the lens. If you had experience with daily contacts, handling the large squishy ext. wear lens would be no problem, however, ham handed first timers tend to rip them to shreds. An advantage to the new lens is the material. Eye proteins will not stick to them so the major cause of discomfort over time is eliminated. Now the disadvantage, the new lens is not yet approved buy the FDA for extended wear, only daily wear. This means your doctor is required to tell you that you can't wear them for extended periods. My doctor did say his patients report no trouble wearing them for two weeks. The data is there, the new lens will let more oxygen to your eye and is strong enough to withstand the boiling method of cleaning. Even though the extended wear lenses are hard to handle, they are the greatest thing since net news. I started wearing them the day I went for the contact exam and have had no problems. You will soon hate your glasses. Now at 20/15 , David Hayes Tektronix!tekid!david P.S.-- Has anyone heard of the new portable scopes introduced this week????