can most people wear extended wear lenses 
Author Message
 can most people wear extended wear lenses

I am a contact lens wears (many years) and currently use Biocompatables
Proclear (-5.5 14.2/8.6) without problem. I am considering asking my optican
about exteneded wear (purevision / night & day) because of the added
convience.

a) Is an extended lens likely to fit ok? 14/8.6 for purvision and 13.8/8.4
13.8/8.6 for Night and Day. I have large pupils hence by current use of
proclear as they are 14.2 (although other optician have prescribed smaller
lenses before?)

b) Aside from fit, is their a preference between Purevision or Night on Day
for any reason (comfort, cost, etc)

c) Is sleeping in a extended wear safe? Would the extended wear lens used
for 30 days actually let more oxygen to my cornea than the current proclear
lens uses all day every day, and out at night during sleep?

d) Any comments?



Sun, 18 Mar 2007 00:57:50 GMT
 can most people wear extended wear lenses

Quote:

> I am a contact lens wears (many years) and currently use Biocompatables
> Proclear (-5.5 14.2/8.6) without problem. I am considering asking my optican
> about exteneded wear (purevision / night & day) because of the added
> convience.

> a) Is an extended lens likely to fit ok? 14/8.6 for purvision and 13.8/8.4
> 13.8/8.6 for Night and Day. I have large pupils hence by current use of
> proclear as they are 14.2 (although other optician have prescribed smaller
> lenses before?)

Silicone hydrogels do not fit as do HEMA hydrogels or GMMA hydrogels.
The only way to know if it fits is to be trial fitted with them and
observe the performance on the eye.

Quote:

> b) Aside from fit, is their a preference between Purevision or Night on Day
> for any reason (comfort, cost, etc)

And let's not forget about the other silicone lenses recently available
and soon to be available. The preference should be based on fit and
comfort. Cost is a personal issue.

Quote:

> c) Is sleeping in a extended wear safe? Would the extended wear lens used
> for 30 days actually let more oxygen to my cornea than the current proclear
> lens uses all day every day, and out at night during sleep?

Clinical studies show they are safe when prescribed and used as
directed. If you pay attention to that, and remove them if you suspect a
problem, get regular check-ups, they are likely to be safe.  All the new
silicone lenses allow at least three times and a much as 5 times the
oxygen transmission of the Proclear which, by the way, has one of the
highest levels of non-silicone based soft lenses.

Quote:

> d) Any comments?

Yes. Your pupil size.  If it is more than 7.0 mm in reduced
illumination, you may want to consider the lens optic zone diameter as a
key issue, if night vision matters. The overall diameter is meaningless,
if the lens centers well and fits correctly. I'm not certain without
checking which lens has an optic zone of at least 8 or 9 mm.

--LB

--
Dr. Larry Bickford, O.D.
Family Practice Eye Health & Vision Care

The Eyecare Connection
http://www.eyecarecontacts.com
larrydoc at eye-care-contacts dot com (remove -)



Sun, 18 Mar 2007 04:06:50 GMT
 can most people wear extended wear lenses

Quote:

> I am a contact lens wears (many years) and currently use Biocompatables
> Proclear (-5.5 14.2/8.6) without problem. I am considering asking my optican
> about exteneded wear (purevision / night & day) because of the added
> convience.

> a) Is an extended lens likely to fit ok? 14/8.6 for purvision and 13.8/8.4
> 13.8/8.6 for Night and Day. I have large pupils hence by current use of
> proclear as they are 14.2 (although other optician have prescribed smaller
> lenses before?)

> b) Aside from fit, is their a preference between Purevision or Night on Day
> for any reason (comfort, cost, etc)

> c) Is sleeping in a extended wear safe? Would the extended wear lens used
> for 30 days actually let more oxygen to my cornea than the current proclear
> lens uses all day every day, and out at night during sleep?

> d) Any comments?

In a nutshell they are safe and you are probably better off changing
over to extended wear for the oxygen benefit.

Fit: the extended wear lenses fit most people very well with less
fitting problems than conventional soft in my experience.

Purevision vs Night & Day: ideally try both, maybe one in each eye if
possible. No clear favourite, it's "horses for courses".

Safety: as far as microbial keratitis is concerned, research is still
underway but it seems to be as safe as what you are doing now. One of
the biggest issues with the current generation of extended wear lenses
is CLPC (irritation under the eyelids)... this is not "dangerous" more
more irritating. There are other potential issues, as there are with any
type of contact lens.

Comments: go for it, with the help of an optician/optometrist who is
experienced with these lenses.

Dom



Sun, 18 Mar 2007 18:51:39 GMT
 
 [ 3 post ] 

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