Due to the rx the lenses might be warped. Check the front curve horizontally and vertically.
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Due to the rx the lenses might be warped. Check the front curve horizontally and vertically.
There is no difference between ground prism and decentered prism
You must use a bonded diamond to grind glass. If lenses are heat treated they will probably shatter if you try to reedge them. If they were chem hardened you might have some success.
Being it is not possible to remove or wear out the polarizing filter just demonstrate to the customer that the lenses still work and don’t need replacing
Give the measurement to the lab of the step depth and the angle of the incline. A good edging will follow you’re instructions.
Anyone have experience with addonoptics laminating lens system
I believe it was Armorlite who was first to make plastic lenses.
Cr39 was originally made to line the fuel tanks on ww2 bombers at the end of the war they started looking for other outlets for the material.
Many decades ago when glass ruled you had to put the lens in cutter before you edged it. The cutter used the pattern and cut the lens 2 mm larger than the finished size. After the lens came out of...
Try tracing the demo lens instead of the frame
Fitting and dispensing +18 requires a little more effort than just ordering the lens. Did the doc give a vertex distance if so did you match it or compensate for the difference. The patient will need...
DRK
i am sure you never had poly that was uncoated on the back they would become unusable within days of purchase if you did.
Correct but not just 1.67 poly or 1.56 or anything except cr
Any lens that gets a/r must be src on both sides or will you have coating failure very rapidly.. non a/r lenses of high index must have src. Cr is the only one where it is not essential. If the lab...
You can do the same calculations on Opticampus
Place it where it will not interfere with the blocking of the lens
It is called a salt pan because it was designed to use with salt. It works great and any residue is easily washed off.
The quality of the coating can absolutely be affected by the application. Errors can happen in any process but the lenses should not be sent out to the customer. In addition if is a licensed process...
Aligning the pins should be simple you will need a fixture to do it. Not holding ink can usually be fixed by adding a few drops of dawn to the ink.
You are referring to mechanical issues due to angle if the lens and yes you blocker will eliminate that i am referring to the prism displacing the image a causing the blocking problem.
It is most likely not slippage but the prism causes misalignment in the blocking. Get some Plano prisms and counter the prism in the blocking process
The reason you turn a segmented lens around to check the power of the add is this eliminates the thickness of the lens which adds plus power to the seg. When you do this you must read the distance...
Uncut
if you keep the b constant and increase the a you will have a different shape with each size never saw a frame with those characteristics.
eEssilor did not go with the spherical front route because Zeiss and Seiko had a patent on the process and they would have had to pay Royalties to do so.
Never actually saw it just read about it in Optical World magazine about 10 years ago if any one has a back issue it would help.