Phase Focus | Oxygen transmissibility
Phasefocus brings to multiple markets a range of products and services based on its proprietary Phasefocus Virtual Lens®
phasefocus, phase focus, Live Cell Imaging, Ophthalmic Metrology, Electron Microscopy, virtual lens
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Oxygen transmissibility

Knowledge of the oxygen transmissibility (Dk/t) of hydrated contact lenses is important to ensure that there is adequate oxygen flux to the cornea, and to thereby avoid overnight corneal oedema and limbal redness.

Traditionally, transmissibility is quoted as a single value, derived from the centre thickness of a lens of a particular power. However, this does not correctly represent the clinically more relevant oxygen transmissibility distribution over the whole lens area.

Phasefocus power maps provide:

  • Dk/t maps across the entire lens area with unsurpassed lateral resolution of 7µm
  • Comprehensive Dk/t characterisation of lenses with complex spatially-varying thickness profiles, such as toric lenses and multi-focal lenses
  • Quantitative measurements of clinically relevant differences in Dk/t across the power range, and between central and peripheral areas

Dk/t GUI example: