lens surface problems

[jb@hawkins]

Hello all. Has anyone ever noticed what appears to be an orange-peel effect on the surface of plus powered lenses? It seems to run across all materials but is most noticable on my polycarb lenses. I am using DAC polish and pads. I run these on LOH cyclinder machines. My pressures are 3.0 bar run for 6 minutes at spd 8. Any ideas would be greatly appreciated as I have been fighting this for some time now.....lol.

Thanks in advance :cheers:
JB

[Darryl Meister]

Assuming that this is occurring on the Rx (back) surface, and not the coated factory surface, you might look at your polishing process. My understanding is that orange-peel (also called a water polish) and polishing burns, which both result in a blister-like surface, are the result of inadequate slurry on the polishing pad. This could be caused by slurry that's too watery (low Baume) or spouts/hoses that aren't aimed at the lap tool. You can also pre-wet the polishing pad before polishing and pin bevel the lens blank to ensure adequate flow of slurry across the pad. And, of course, ensure that you are using the LOH's recommended cylinder machine settings (e.g., pin pressure and polishing time) for polycarbonate. Though, if polishing burns are your problem, you should probaby be seeing this on plus and minus lenses...?

Best regards,
Darryl

[jb@hawkins]

yes, I am seeing this on plus and minus lenses, it just shows up worse on the plus lenses due to magnification. So far I have tried adjusting times, spd, pressures and several different companies pads. So now I'm looking for any other suggestions....lol.


Thanks again,
Jb

[optispares]

well as you have changed everything else you could try a different brand of polish.
I have seen an orange peel effect disappear when the polish has been changed.

[JRS]

Darryl's references are the most likely. And tell Kevin and Bud I said hello.