Yes, some of the patients didn't want their lenses to be polished, since they were also facing the same problem - Glare!Originally Posted by jsutcurious
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Samuel
Yes, some of the patients didn't want their lenses to be polished, since they were also facing the same problem - Glare!Originally Posted by jsutcurious
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Samuel
Remember we are talking about the edges not the front and back surfaces, I have had quite a few (before I stopped polishing all edge surfaces as freebie extra service) complain about the glare from same and ask that I remove the polished surface.
Chip
Just another good intention gone wrong.
Last edited by chip anderson; 04-08-2006 at 08:42 PM. Reason: mo
This discussion about polished or nor polished lenses existed already in the 1950s and 60s with the only difference that during those days the lenses were made from glass.
If we sold a pair of lenses with polished lenses and the customer came back sating that the glare bothered him. We passed the lenses over the ceramic stone, 30 seconds per lens.........................or if he had non-polished edges and wanted them polished,................we buffed them on a felt wheel which took maybe 2 minutes per lens.
Today we use plastic lenses which are even easier to handle...........you can still polish and un-polish the same way as in the old days. On polycarb you can even polish edges by jusr wiping a chemicals over the edge.
Do they hard coat them?Originally Posted by optixbil
The lab we use for coatings will AR coat a lens but will only hard coat it first if it is a full blank. I only like to sell hard/AR coats.
AR coatings are made with SIO2 which becomes as hard a surface as you can get when it is applied as an AR soatingOriginally Posted by rsandr
Silicon dioxide General Other names Silicasee text Molecular formula
SiO2
Molar mass 60.1 g/mol
Appearance white or colourless, solid (when pure)
CAS number [14808-60-7]
Properties
Density and phase 2.6 g/cm3, solid
Solubility in water insoluble
Melting point 1610 °C
Boiling point 2230 °C
I dont doubt you for a minute but a few coating labs I know have sold AR and hard AR as separate products.Originally Posted by Chris Ryser
Are they taking the pish?
After having looked up the word "pish" in the dictionary.................I am still learning...........I would say that they are taking the pish.Originally Posted by rsandr
There is no soft or hard SIO2 once it has been vacuum coated on a sustrate as far as I know.
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