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????