AR coated lens has thumbprint defect

[rdcoach5]

A patient who was a previous non-adapt to Poly recently complained of one of his CR-39 lenses causing starburst from lights at night. I had thoroughly checked for waves because of his previous problems with Poly. He dropped them off when I was on vacation so my co-worker sent them to our local lab to check.They also could not find anything wrong in the lensometer. Again, I couldn't either until I looked at the lens against an incandescent light bulb.It looked like the surface of the left lens had a thumbprint on it and in putting on the glasses and looking at the light, I could definitely see more starburts off this lens. I assume there is a defect on either the base scratch cote or 1 of the AR coats. Any thoughts? I definitely could not see this thumbprint when looking at the lens in front of a fluorescent light and it's only on the one lens.

[For-Life]

A patient who was a previous non-adapt to Poly recently complained of one of his CR-39 lenses causing starburst from lights at night. I had thoroughly checked for waves because of his previous problems with Poly. He dropped them off when I was on vacation so my co-worker sent them to our local lab to check.They also could not find anything wrong in the lensometer. Again, I couldn't either until I looked at the lens against an incandescent light bulb.It looked like the surface of the left lens had a thumbprint on it and in putting on the glasses and looking at the light, I could definitely see more starburts off this lens. I assume there is a defect on either the base scratch cote or 1 of the AR coats. Any thoughts? I definitely could not see this thumbprint when looking at the lens in front of a fluorescent light and it's only on the one lens.

Coating is crazing. The thumb print makes me believe that it could have been caused by pressure during edging. Replace it under warranty an the problem should be fixed

[NAH]

We received a lens at my office that had something that looked like a fingerprint. It turned out that the lab that made the lenses had created a whole batch of defective lenses. When we told the lab, they pulled a bunch of lenses because no one there had noticed. On the upside, they fixed the problem. On the downside, the defective lens we received went to a patient who had already experienced two remakes with that one pair of glasses.

[Chris Ryser]

A thumprint is usuallly a not or badly cleaned lens before the slick coat was applied is is now embalmed below the slick coat. Have the lab remove the slick coat clean it and re-apply

[LilKim]

I agree with Chris' assessment--sloppy AR company employees are to blame, not the coat. Just send it back with the original invoice number and request a strip and recoat. They should do it for you at no charge.

[For-Life]

Absolutely not!!!

Why strip and recoat? Every time you do that, you just produce a weaker lens/AR combination. The lab made the mistake, they should replace the WHOLE lens. I have never ordered a warranty job where I asked them to strip and recoat.

[thep]

Absolutely not!!!

Why strip and recoat? Every time you do that, you just produce a weaker lens/AR combination. The lab made the mistake, they should replace the WHOLE lens. I have never ordered a warranty job where I asked them to strip and recoat.

As it should be!
(however) it could happen in the edging process also. Our customers have has great seccess using an orange ( or any color for that matter) on the back side of their minus lenses It helps disperse the pressure Whatever the cause...REMAKE

[Uilleann]

I'd almost bet the farm that the chuck pressure was too high during edging, and/or a bad diamond wheel caused excessive torsion on the lens. You'll get crazing in the middle of the lens(es) where the block was mounted. It often looks like a thumb print - but isn't. Depending on the lens itself, and the amount of crazing, it can be very difficult to see in regular indoor lighting conditions. Regardless, the lab should replace outright, and NEVER just re-coat. Particularly if it's a stock lens.

Best!

:cheers::cheers:

[DragonLensmanWV]

Over 35 years ago, a rep came by from Chicago trying to sell us some stock lenses. They were very cheap, extraordinarily so, even for that time. They were made in Venezuela of all places, and when I got one out of the package, it had a fingerprint on it, which as I tried to clean it off, became apparent that it was integral to the lens. Uncoated CR-39!! My guess was they yanked them out of the mold way too soon and were exposed to very sloppy handling. A fingerprint permanently ensconced on the surface of a lens!
Can you guess if I bought any?

[Chris Ryser]

I have never ordered a warranty job where I asked them to strip and recoat.

...........you have been doing the right thing, .........................but you will never know if they stripped it and re-coated or not.

[Chris Ryser]

I agree with Chris' assessment--sloppy AR company employees are to blame, not the coat. Just send it back with the original invoice number and request a strip and recoat. They should do it for you at no charge.

Stripping a slick coat is a very simple thing and will not even affect the AR underneath.

[bob_f_aboc]

...........you have been doing the right thing, .........................but you will never know if they stripped it and re-coated or not.

Sure I do! I don't send in the old lens until I receive the new one.

[Jana Lewis]

Sure I do! I don't send in the old lens until I receive the new one.

Riiight? DUH!!! :p

[Chris Ryser]

Sure I do! I don't send in the old lens until I receive the new one.

If I would be the lab, I would charge you until I would get the lenses to verify your claim. If it would turn out to be a fingerprint under the slick coat, which can be removed in a few seconds you would never get the credit. :D

[Jana Lewis]

If I would be the lab, I would charge you until I would get the lenses to verify your claim. If it would turn out to be a fingerprint under the slick coat, which can be removed in a few seconds you would never get the credit. :D

My lab appreciates my business... they will do whatever I ask.

[Barry Santini]

Sounds Like a THARCLE defect to me.

By any chance, were these Crizal Avance or Alize Clear Gard?

Let me know.

Barry

[For-Life]

If I would be the lab, I would charge you until I would get the lenses to verify your claim. If it would turn out to be a fingerprint under the slick coat, which can be removed in a few seconds you would never get the credit. :D

Chris, this is what happens.

I reorder the lens. I get the lens with an invoice where I am charged. I send back the old defect lens and then I get a credit.

So yeah, they can now verify that I am not just trying to get free lenses (and rightfully so) and I get a brand new lens under warranty.

Win/win/win :)

[Happylady]

I got a bad Crizal Avance a couple of weeks ago. The one lens was "crazed" in a half circle. Unfortunately it was the patient who found it. :( I had to hold the lens up to a light and turn it just so to see it.

[Chris Ryser]

My lab appreciates my business... they will do whatever I ask.

understand your point...........................the or else factor. :D

[rdcoach5]

Sounds Like a THARCLE defect to me.

By any chance, were these Crizal Avance or Alize Clear Gard?

Let me know.

Barry

Barry, yes they are Avance.

[rdcoach5]

If I would be the lab, I would charge you until I would get the lenses to verify your claim. If it would turn out to be a fingerprint under the slick coat, which can be removed in a few seconds you would never get the credit. :D

Chris, what removes the slick coat and what are the risks?

[thep]

understand your point...........................the or else factor. :D

Perhaps it is the "what is right" factor. There are STILL some of us around...........

[Chris Ryser]

Chris, what removes the slick coat and what are the risks?

A 1 - 2 second dip into hot lens dye neutralizer. In and out should do it. Don't see any risks as it is too fast to heat up the lens.