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How Prescription Eyeglasses Lenses are Made / Fit

1. Lensometer: The lens prescription is verified from the lab. The optical center of the lens is dotted. This is how we line up the cylinder on correct axis and line up the optical center with the PD given. This allows for the best optics. 2. Tracing: The demo lenses are removed from the frame and placed into the tracer. There is a needle which will follow the frame and a picture of the shape will show up on the screen. 3. Blocking: The PD is entered into the tracer and the center of the lens and the PD are lined up here using the dots from before. A blocker is added to the lens so it can be held into the grinder. 4. Grinding: The trace is loaded into the edger and the lens is placed inside. The machine grinds the lens into the correct shape. 5. Unblocking 6. Safety Bevel: The lens edges can be sharp so a safety bevel is applied to every lens before mounting. 7. Mounting: The finished lenses are inserted into the frame For more information on prescription eyewear, visit Perfect Glasses USA resource center at http://www.perfectglassesusa.com/cont...