dr@ski.UUCP (David Robins) (01/10/86)
Two questions have been asked of me in relation to some recent
postings I made to this newsgroup about soft contact lenses and
contact lens correction of astigmatism.
1) Where to get "saline tablets"-
These are available in most drugstores in the contact lens solution
area. One brand name I know of is Blairex- they make salt tablets as
well as the bottle to prepare it in. Other companies offer it also-
Bausch & Lomb used to. Be careful though- the tablets are available
in difference sizes (ie. ~130 mg , 250 mg). To get the proper saline
concentration necessary for comfort, the bottle size must be marked
for the amount of water corresponding to the tablet size. It is also
recommended to prepare fresh saline each day, since there are no
preservatives.
2) Why toric back surface lenses may be less comfortable-
Some rigid contact lenses have a toric back surface to get a better
fit on the cornea, with less rocking. Then each blink, which tries to
rotate the lens, tends to push the the curves of the "keying"
cylinders against each other. This leads to more epithelial contact,
and hence, less comfort (more lens awareness). Some people are not
really bothered by this, though.
--
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David Robins, M.D.
Smith-Kettlewell Institute of Visual Sciences
2232 Webster St; San Francisco CA 94115
415/561-1705
{ihnp4,qantel,dual}!ptsfa!ski!dr
The opinions expressed herein do not reflect the opinion of the Institute!