Q&A - Questions and Answers

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Issueswith Silicone Hydrogel Lens Wear Silicone hydrogel (SH) materials have allowedclinicians to fit their patients with hydrogel lenses that supply sufficientoxygen to eliminate hypoxia. > more

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Questions and Answers

A list of Questions and Answers have been answered by our panel of experts.

Archived Questions and Answers

1.	I am an optometrist in New Jersey and have been fitting silicone hydrogels for the past 2 years extensively. I have recently come upon a few patients whereby I have noticed a significant drop (between 3-5 mm ) in IOP after wearing these lenses. The patients had all been either wearing conventional DW or Acuvue lenses as EW. I don't normally measure IOP's on follow ups but noticed first with a patient I had targeted as a glaucoma suspect with pressures running 20-22 mm. He was refit from Acuvue EW to Focus Day/Night and I measured a 5 mm drop in both eyes. I have been now looking for it and found 3 more patients with similar phenomena. My theory is that with silicone hydrogels we are getting a truer measurement since cornea thickness is more normal (or thinner that what is was with other lower DK materials). Have you seen similar phenomena? What do you think?answer
2.	I know that use of fluorscein is ok with SH lenses. Does the surface treatment on these lenses have any affect on their absorbtive properties, i.e., use of ocular med's for treatment of glaucoma? Are they any less likely to absorb pharmeceutical drops than conventional hydrogel lenses?answer
3.	Can the preservatives sorbic acid and EDTA (ingredients of Clerz rewetting drops) damage the lens surface of Night&Day contact lenses?answer
4.	Could the panel please tell me the current research rate for microbial keratitis for the following modalities? a) daily wear monthly disposable b) continuous wear monthly disposable c) daily wear contact lensanswer
5.	Which is the pore size of Focus N-Day and Purevison ?answer
6.	Are there any problems with heat disinfection with non-preserved saline?answer
7.	I have always been told to advise patients not to shower with contact lenses in. So why is this allowed with silicone hydrogel lenses? Secondly, can patients swim in these lenses?answer
8.	Assuming the lens fits well is there any reason why I cannot fit a post LASIK patient with a continuous wear Silicone Hydrogel lens?answer
9.	I have a 60 year old white female patient who was diagnosed with open angle glaucoma when she was 40. She currently uses Xalatan and Cosopt. I have prescribed Ciba Night and Day lenses. She is wearing them as a day wear lens. Has there been any studies looking at the use of extended wear contact lenses with these and other anti-glaucoma medications? Would the medications be less effective if the patient used them when she was wearing her contact lenses? answer
10.	What is the incidence of SEALS, microbial keratitis and CLPU with silicone hydrogels?answer
11.	Since the recent article by Dr. Kathyrn Dumbleton affirmed what I expected, that silicone hydrogels may work better than other CLs for patient's with chronic dry eye problems, especially in a daily wear mode, how often should the lenses be disposed, if cleaned and worn as DW lenses?answer

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