White edges of lens

[TRISH]

What can I do about the edges of my lens appearing white? I've tried polishing the edges but this doen't seem to work when looking at the patient directly. Maybe I should polish the edges more? I don't have the problem with full rimless just all other types of frames. Any idea's?

Thanks,
Trish:hammer:

[HarryChiling]

A mini bevel or a front bevel will help with this, I think the mini bevel only comes on an AIT edger, but the front bevel could help.

[gemstone]

What can I do about the edges of my lens appearing white? I've tried polishing the edges but this doen't seem to work when looking at the patient directly. Maybe I should polish the edges more? I don't have the problem with full rimless just all other types of frames. Any idea's?

Thanks,
Trish:hammer:

Are you using dry cut edgers?

[TRISH]

I am still in the ice age. I use a Weco edger and a ceramic hand stone.

[gemstone]

I know this was worse with dry cut edgers. It is more noticeable on tiny eyewires. A standard bevel looks like a ring. I've seen opticians get preoccupied with this. That's why AIT has the mini bevel option.

[Barry Santini]

Using CR 39 lenses with an AR coat... Do not Polish the edges...

then turn down your tint unit to approx 160 degrees..

Then quickly dip same lenses in the regular brown tint..

DO NOT QUENCH in any water...let them cool down naturally...

then clean them...

Voila! The best edge finish you'll ever see.

FWIW

Barry

[Happylady]

Using CR 39 lenses with an AR coat... Do not Polish the edges...

then turn down your tint unit to approx 160 degrees..

Then quickly dip same lenses in the regular brown tint..

DO NOT QUENCH in any water...let them cool down naturally...

then clean them...

Voila! The best edge finish you'll ever see.

FWIW

Barry

You can put AR lenses in 160 degree tint bath? Does this work only with cr39?

What about using a cotton swab to careful color the edges? I have a white edge on a pair of grooved rimless edges but I am not sure if they are poly or 1.67. I don't remember.

[Chris Ryser]

..................but I am not sure if they are poly or 1.67. I don't remember.

If you have a problem to distinguish between poly or something else look up the patients record, that might help.

Lens material is really un-important as you really put the AR coated lens in danger by exposing it to the heat of a dye pot.

[Happylady]

If you have a problem to distinguish between poly or something else look up the patients record, that might help.

Lens material is really un-important as you really put the AR coated lens in danger by exposing it to the heat of a dye pot.

They are my glasses. I am not a work right now to look them up. I think they are poly, but I am not sure.

[Mirror]

One of the standard tests for AR is a boil test. You make up a solution of water with salt (NaCl) and potassium chloride (KCl). Get it up to a boil. Then you dip the AR coated lens in it for 2 minutes and immediately quench the lens in room temperature water for 1 minute. The lens should be able to take this for at least 6 cycles without and damage. Thats the Colts lab standard test. I've left the exact solution formulation out for brevity, but Colts can provide it, if you need it.

A dip in 160 degree water should not hurt the lens or the AR. Especially with a room temperature cool down.

[OPTIDONN]

Aw man!! I just tried this with a pair of 1.67 Pentax lenses and just destroyed the coating! I should have let the temp drop more. It was at 185 and in there for 20 sec.:hammer: But the edges looked great!

[Fezz]

Aw man!! I just tried this with a pair of 1.67 Pentax lenses and just destroyed the coating! I should have let the temp drop more. It was at 185 and in there for 20 sec.:hammer: But the edges looked great!

Call Pentax, the lenses are WAY DEFECTIVE, and have a SUCKY coating...:D

[apaul]

Years ago about mmm 20 we used to sell a lot of plastic frames remember Anglo American? big 56/20 plastics
People wanted all sorts of colours so we had pots of cold dye which we dipped them into to get the desired effect

Would this dye work for lenses and is it still available?

Love to know because the white rings drive me mad

Thanks

Alan

[braheem24]

They are my glasses. I am not a work right now to look them up. I think they are poly, but I am not sure.

It will not work for poly since poly itself does not absorb tint the src does since there is no SRC on the edges you'll only weaken the A/R trying it.

There are numeour companies that make pens for painting the edge of a lens. (Hint of tint, Camoflage, etc).

[Barry Santini]

You can put AR lenses in 160 degree tint bath? Does this work only with cr39?.

Yes, a good AR (such as Crizal) can easily handle this. Poor ARs will....die!!

Higher Index lenses will be more sensitive to the temperature of the bath (as you found out the hard way!)

Follow my instructions as above, and you'll have no problems.. The additional lens thickness you may have with CR-39, for *most* Rxs, will be profile-camoflauged by the use of todays, moden-zyl frames.

FWIW

Barry

[DragonLensmanWV]

Yes, a good AR (such as Crizal) can easily handle this. Poor ARs will....die!!

Higher Index lenses will be more sensitive to the temperature of the bath (as you found out the hard way!)

Follow my instructions as above, and you'll have no problems.. The additional lens thickness you may have with CR-39, for *most* Rxs, will be profile-camoflauged by the use of todays, moden-zyl frames.

FWIW

Barry

I have done this many times with nary a spoilage. Of course, Poly won't work, but I've done the same thing with my Hoya 1.70. If you are unsure, just use the Q-tip method, but use the dye at full temp because it will cool down too quickly.

[Barry Santini]

Great tip...Thanks!

[TRISH]

Thanks Barry. I will try this.
Trish