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It was a university study and they did eat more and grew faster that is what they wanted determine. I did learn that chickens are nearsighted in one eye and farsighted in the other it has something...

I had to make 200 pair of lenses in varying Rx’s edged 15 mm round to glued over the eyes of chickens to see if they would eat more if their vision was better and they could see beyond 3 ft.

Red jewelers rouge

Barry is correct the issue is how much do you compensate for the wrap. This was an issue before wrap frames became popular when we had to fabricate high base lenses I.e. cataract lenses 12 base and...

Make sure the fresnel is smaller than the lens you applying it so it doesn’t touch the frame. Add a few drop of dish detergent to the water it will work wonders in eliminating bubbles.

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Cr39 was originally made to line the fuel tanks on ww2 bombers at the end of the war they started looking for other outlets for the material.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.