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Short guide to custom parameters

Usually the power prescribed is the prescription of the doctor or optician who does not take into account the frame that your customer wants to wear in his or her daily life. After years of development of FreeForm technologies, it is finally possible to combine the data of the frame and the shape chosen by your customers, ensuring the production of lenses with both aesthetic benefits, like reduced thickness and lower weight, and optical performance, since your customer will get exactly the prescription he or she needs, improving vision in every direction and reducing distortions.


For this reason, completing the order with the customisation parameters specific to each patient, is critical for producing unique lenses that are fully tailored to the needs of your customers.


But what are these parameters? What do they mean? How should they be ordered?
This short guide can be useful for better understanding these issues.



The order should include all the following parameters:



1. Corridor
It is the area used for intermediate vision, which progressively increase the power with a progression depending of the geometry, up to arrive to near vision power. The corridor combines the long distance area optical center to the optical center of the near vision.


2. Mounting height
It is the segment that combines the long distance optical center to the inferior edge of the template.


3. Inset
Nasal movement of the near vision optical center compared to the position of the long one.


4. Interpupillar half-distance
Half-distance between the two long distance optical centers.


5. A Box
Maximum horizontal dimension of the template.


6. B Box
Maximum vertical dimension of the template.


7. DBL
Minimum distance between the surfaces of the nose pads or the edges of the frame.


Pantoscopic angle
Tilt of the front of the frame compared to the temple stated in grades.


Wrap angle
It represents the curve of the front of the frame.


Back vertex distance.



When you receive lenses from your manufacturers, your frontifocometer detects a power that is different from what was ordered, because it is recalculated taking into account all the custom parameters you entered in the order. The recalculated power is called compensated power and it is what should be measured to verify that the lenses have been produced correctly. The latter is usually specified in the bag of your lenses, under the prescription you ordered:



Order your personal lenses as soon as possible, providing all the custom parameters to get the best lenses ever for your customers.


Have you already read the other LTL Academy articles?  Learn more.

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