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| Dr. William Trattler said:
http://www.asklasikdocs.com/forum/main/3700.html
"First...all lasers can now have an ablation zone larger than
6.5mm."
And here is some important clarification:
There is a big difference between the optical zone (also known as the
effective optical zone, EOZ, or full treatment zone) and the ablation
zone, which can include the optical zone plus a blend zone. It is true
that all lasers can have an ablation zone larger than 6.5mm, but the
VISX and ALCON lasers are NOT APPROVED FOR AN OPTICAL ZONE LARGER THAN
6.5mm IN THE UNITED STATES.
If anyone disagrees, please provide a link to the approval order. Just
checked the FDA website, so good luck with that.
If your pupils are 7mm or larger, your effective optical zone will be
smaller than your maximum pupil size if your doctor is US surgeon
following FDA regulations. The B&L laser claims an optical zone
'BETWEEN 6 and 7' - this is the largest approved optical zone in the US
- and they do not claim a full 7mm. Please be aware that optical zones
for multiple reasons... have a tendency to turn out smaller than the
surgeon planned. Therefore, if you have refractive surgery, you will
likely have unfocused rays of light entering your pupil from the area
that is not fully corrected when ambient light is low. This causes some
nasty visual side-effects that you don't want.
Dr. William Trattler said:
"So all of the lasers can be used for patients with large pupils."
Here is some important clarification:
There is a difference between 'can' and 'should'.
Well, yes... they CAN be used but large pupil patients may not be happy
with their visual outcome - in fact such surgeries have ruined lives of
large pupil patients. See the Lone Dog's Pupil Primer for Casualty
Prevention:
http://www.lasermyeye.org/keratosco...g31may2003.html
Why have starbursts at all? They are caused by distortions that are
created in the cornea by refractive surgery. All forms of refractive
surgery induce these distortions. The least aberrated corneas you'll
ever have are your virgin (pre-surgery) corneas. Keep your
starburst-free vision, it's truly a gift.
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