Skip to main content
Menu
Book A Free Consult


Home » What's New » Thoughts on No-Touch-Prk modes on some lasers

Thoughts on No-Touch-Prk modes on some lasers

I used to use MMC for Rx above -5, then had some late (>3 mo out) haze for -4, and rarely had it for -3 something

so i reduced my limit for MMC (since it is really perfectly safe if diluted properly and applied on a sponge) to > -3

this depends where you are, like if in an area with more sun/UV/wind/etc scarring is more likely, so need MMC more, i tried through epi PRK years ago, i’m on a VISX, there is an (old) software setting for this (“laser-scrape”)the reason we called it “laser scrape” is that you always get a ring of residual epithelium that you then need to scrape off which defeats the purpose of using the laser to remove the epi (over Amoilis brush) to make it less traumatic/cleaner, the reason again for this optically is the laser becomes more tangential/less orthogonal to the cornea towards the periphery, so the efficiency is decreased, so you get central breakthrough before the periphery.

i understand that modern software algorithms add energy to the periphery to try to obtain uniform epi removal/breakthrough however, there still aren’t great methods that are always used to measure preop epi thickness (preop OCT isn’t common) so then we are reduced to visualizing removal by looking for visual breakthrough i also think that the energy of the eximer on the epi is probably imparted somewhat onto the underlying cornea so that you are probably adding energy/trauma to the underlying cornea while you are doing a laser epi removal which is another reason why you might want to use MMC for -3, especially if you are emplying laser-scrape.

so my suggestion based on the above to avoid haze in future cases would be to:
1. prechill the cornea with frozen BSS preop
2. apply chilled BSS on a sponge after epi removal and before corneal ablation
3. add MMC after ablation
4. add oral steroids postop + Vit C + UV protection
fundamentally, i have had excellent results after EtOH-assisted PRK/LASEK, so don’t know why you need to laser scrape
what is the rationale for using laser-scrape over EtOH-assisted epi removal?
it seems to me that the latter is actually less traumatic, and less prone to scarring (at least in my hands)
although the patients do seem to like the sound of “no-touch/all-laser” from a marketing perspective
eager to hear your thoughts

 

 

No other laser vision correction surgeon in New York….

No other laser vision correction surgeon in New York....

...offers you the opportunity to have a Free Remote Consultation with the surgeon! Ask Dr. Chynn your main question or concern, and will answer, personally, within 2 business days!

Unsure whether you're a good candidate because of a lot of astigmatism? Large pupils? Dry eyes? Maybe you were rejected by LASIK surgeons due to a “thin cornea” or high prescription.

Take advantage of this incredible opportunity to find out if LASEK is an option for you from Dr. Chynn, our famous, cornea fellowship-trained, Columbia & Harvard graduate who’s in MENSA & was the 1st eye surgeon in NY, NJ, CT & PA to get LASIK, & has performed 1,000 PRKs, 5,000 LASIKs, 10,000 LASEKs, and 5,000 epiLASEKs

But please be considerate. Dr. Chynn gets paid $1,000/hour as a consultant for expert networks & expert witness, so please limit yourself to your most pressing question or concern, as he’s doing this for free on a trial basis to help interested patients.

Please include the information below in your email so Dr. Chynn can answer your question specifically.

Age:
Approximate prescription (if known):
Occupation (the more specific the better):
Main barrier or concern:

  • This field is for validation purposes and should be left unchanged.

No other laser vision correction surgeon in New York….

No other laser vision correction surgeon in New York....

...offers you the opportunity to have a Free Remote Consultation with the surgeon! Ask Dr. Chynn your main question or concern, and will answer, personally, within 2 business days!

Unsure whether you're a good candidate because of a lot of astigmatism? Large pupils? Dry eyes? Maybe you were rejected by LASIK surgeons due to a “thin cornea” or high prescription.

Take advantage of this incredible opportunity to find out if LASEK is an option for you from Dr. Chynn, our famous, cornea fellowship-trained, Columbia & Harvard graduate who’s in MENSA & was the 1st eye surgeon in NY, NJ, CT & PA to get LASIK, & has performed 1,000 PRKs, 5,000 LASIKs, 10,000 LASEKs, and 5,000 epiLASEKs

But please be considerate. Dr. Chynn gets paid $1,000/hour as a consultant for expert networks & expert witness, so please limit yourself to your most pressing question or concern, as he’s doing this for free on a trial basis to help interested patients.

Please include the information below in your email so Dr. Chynn can answer your question specifically.

Age:
Approximate prescription (if known):
Occupation (the more specific the better):
Main barrier or concern:

  • This field is for validation purposes and should be left unchanged.