Would this be considered an AR defect, lab keeps sending coatings like this.

[CosmicAura]

I'm a newer optician who now is working at a location where I'm doing more inspections as glasses arrived from the lab. I understand anti reflective coatings will have certain Newton rings
But they do not affect anything visually just a bit unsightly. However, we keep getting lenses back from our lab that look like these that have a run in the coating. Still not really visible looking through the lens unless in fluorescent lighting. Am I being to picky or would you send these back? Thanks


See attached picture.

[CCGREEN]

It's all good. Looks just like it supposed to. Carry on.

[IIxIPariahIxII]

Yup. Only time something similar will be a defect is if the chuck/block from the edger crazed the coating at point of contact or the pad lifted the coating. Both look a little different from the rings.

[Kwill212]

I wouldn't send it back. If a lab sent that to me more than once, I would just find a new lab.

[NAICITPO]

I wouldn't send it back. If a lab sent that to me more than once, I would just find a new lab.

This

[Robert_S]

Not index matched to the substrate

[Elvis Is Alive]

Not index matched to the substrate

This. The problem was solved long long ago. I would never pass inspection of a lens looking like that.

Here is a thread from 2011! talking about this: https://www.optiboard.com/forums/sho...g-Newtons-Ring

[Lensman11]

If you are talking about the Newtons rings totally normal that scratch is not.

[CosmicAura]

This. The problem was solved long long ago. I would never pass inspection of a lens looking like that.

Here is a thread from 2011! talking about this: https://www.optiboard.com/forums/sho...g-Newtons-Ring

Nice that sent me down a rabbit hole of info thanks.

I'm guessing VSP tech shields do not have substrate matching (I can only find info that is a hoya only technology) even in elite as that's what these are. It did dawn on me to mention these are 1.67 so it's likely exacerbating the aesthetic issue.

I'm being very cautious with this vsp lab because Ive been seeing very egregious issues like gouged frames, rough edge jobs, defects etc just didn't know if this was something else to add to the list.

Unfortunately can't change labs easily since we are a corporate bought private practice. We ship two states over to a vsp satellite even though vsps main lab in colmbus is just like two hours away, makes little sense.

No lab is perfect of course most customers are happy but we went from hoya to VSP before my time here so the pickier customers really notice the difference.

[ChrisBowers]

Caused by high index lenses with scratch resistant coating of a much low index of refraction. Move it out of florescent lighting and this goes away, even so it is imperceptible from the wearer’s standpoint. If we could let CR-39™ die, we could much better match mid and high index lenses. It would be prohibitive to have multiples of hard coats.
Chris

[NAICITPO]

See attached picture.

The blue bowl with a spoon... Are you eating ice cream in the lab?!? Good times

[amdblack]

I know I am late to the game but I am excited about this web site. That is NOT normal and your labs should be matching the index of refraction on all materials. You should not have to ask. Send it back!

[Mauro.Airoldi]

two considerations on Newton's rings, firstly the problem of the many types of Hard coat index, consider that an average company in Europe uses at least 3 different types: HC not tintable for CR39, HC not tintable for MR8/MR10/MR174 and HC tintable for all colours. You will hardly find HC for very high indices for RX.
second thing, from the type of curvature of the fringes I would say that it is a HC lens obtained for spinning, in this case most of the small laboratories only use one type of HC

[Prentice Pro 9000]

This. The problem was solved long long ago. I would never pass inspection of a lens looking like that.

Here is a thread from 2011! talking about this: https://www.optiboard.com/forums/sho...g-Newtons-Ring

When we talk about substrate matching is it lens to hardcoat or hardcoat to AR coat? Or is it a matter of both at times?

[Lensman11]

Lens to hardcoat

[Prentice Pro 9000]

Lens to hardcoat

Thank you for clearing that up. Are all ARs compatible with all hardcoats? So for instance, if we actually got index-matched coatings, would it contraindicate the use of any AR coatings?

[Lensman11]

No they are not. The scratch resistance and adhesion of the ar change with the hard coat.

[Prentice Pro 9000]

No they are not. The scratch resistance and adhesion of the ar change with the hard coat.

I see. Are there known combos that do not mix? Like "you can't put a sapphire on an index matched 1.74".

[Lensman11]

The lab can do whatever they want but the performance will suffer meaning scratch resistance adhesion and impact resistance. Ignore the newton rings and you will have good performance.

[Prentice Pro 9000]

The lab can do whatever they want but the performance will suffer meaning scratch resistance adhesion and impact resistance. Ignore the newton rings and you will have good performance.

Is there a best practices guide somewhere that outlines which coatings perform the best with each other?

[Lensman11]

I don’t think there is a guide. Order from a lab that provides consistent results and you will never have issues with your customers.