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Ekomi 4.8/5.0

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Center thickness

Related to the term – contact lens transmissibili­ty (Dk/t)

The Dk value determines the properties of a contact lens material. A contactologist has to take the thickness of the lens (in cm) into consideration as well as the permeability. Together they form the Dk/t value, called transmissibility, which characterises a lens.

The unit is defined in Barrer/cm. This value is usually listed by manufacturers only for contact lenses with –3.00 D and the t value is defined as the center thickness, that is, the thinnest part of the lens, which can be slightly misleading for contactologists.


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