Bausch + Lomb Boston products continue to Lead The Way In GP Technology with the introduction of our first hyper Dk gas permeable material – Boston XO2. This premium GP material offers outstanding oxygen permeability (141 Dk using the ISO/Fatt method) without compromising wettability, stability or comfort.

This new GP material combines a Hyper Dk of 141* for excellent oxygen transmissibility with the stability, wettability and performance of a lower Dk material. Boston XO2 is inherently wettable, making plasma treatment optional. This material has received FDA clearance for daily wear for ametropia and certain irregular corneal conditions.

It is available in a variety of handling tints, with or without UV absorber.

* ISO/Fatt method

Key Features & Benefits

  • More oxygen for your patients' corneal health and overall comfort.
  • Inherently wettable material, making plasma treatment optional.
  • Provides the stability generally found in low to mid Dk GP materials.


  • Daily wear
  • Myopia
  • Hyperopia
  • Astigmatism
  • Presbyopia

In addition it is cleared for irregular corneal conditions such as:

  • Keratoconus
  • Pellucid marginal degeneration
  • Following penetrating keratoplasty
  • Post lasik

Material Properties

Trade Name:

Boston XO2 (hexafocon B) Rigid Gas Permeable Contact Lens

Material Name:

(hexafocon B) Rigid Gas Permeable Contact Lens

Oxygen Permeability –
Edge Corrected**


Oxygen Permeability –
Non-Edge Corrected**


Wetting Angle:

(Captive Bubble) 38 deg.


(Shore D) 78 (Rockwell) 101

Saline Absorption:


Refractive Index:


Specific Gravity:



Blue, Ice Blue, Violet, Green
Red, Yellow (daily wear orthokeratology)

*ISO FATT Method: DK Units = x 10-11 (cm3 O2)(cm)/[(sec)(cm2)(mmHg)] @ 35°C

Plasma Treatment

Lenses manufactured from Boston XO2 can be plasma treated in the same manner as other Boston materials.  However, Boston XO2 provides the stability of lower Dk materials and is inherently wettable, making plasma treatment optional.  

Ask your Authorized Boston Manufacturer for more details.

Boston XO2 : Additional information