Gas Permeable (GP) Lens Materials

Boston EO® & Boston ES®

The RGP material for demanding visual needs

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Boston EO® and Boston ES® are indicated for daily wear for the correction of refractive ametropia (myopia, hyperopia, astigmatism, and presbyopia) in aphakic and non-aphakic patients with non-diseased eyes.

Additional offerings:

  • High flexural resistance, excellent for thin and ultra-thin lens designs
  • Available with Tangible® Hydra-PEG® coating technology for enhanced lens wettability
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Corneal astigmatism factors

Select Diameter and Choose Recommended Base Curve

  • Corneal Astigmatism
  • 0.00 to 0.50D
  • 0.75 to 1.25D
  • .50 to 2.00D
  • 2.25 to 2.75D
  • 3.00 to 3.50D
  • 9.2 mm Diameter
  • 0.50D flatter
  • 0.25D flatter
  • on flat “K”
  • 0.25D steeper
  • 0.50D steeper
  • 9.6 mm Diameter
  • 0.75D flatter
  • 0.50D flatter
  • 0.25D flatter
  • on flat “K”
  • 0.25D steeper
(Relative to Flat “K”)
Minus lens center thickness

Suggested Center Thickness

Lens Power Plano -1.00 -2.00 -3.00 -4.00 -5.00 -6.00 -7.00 -8.00

Standard Design:
Boston XO® .18 .17 .16 .15 .14 .13 .13 .13 .13
Boston EO® & Boston ES® .18 .17 .16 .15 .14 .13 .12 .11 .10

Thin Design

Boston EO® & Boston ES®		 .15 .14 .13 .12 .10 .10 .10 .10 .10

Ultra Thin Design

Boston ES®		 .14 .13 .12 .10 .08 .08 .08 .08 .08

  • Select Diameter and Choose Recommended Base Curve (Relative to Flat “K”)

    Corneal astigmatism factors

  • 0.00 to 0.50D

    9.2mm Diameter — 0.50D flatter 9.6mm Diameter — 0.75D flatter

  • 0.75 to 1.25D

    9.2mm Diameter — 0.25D flatter 9.6mm Diameter — 0.50D flatter

  • 1.50 to 2.00D

    9.2mm Diameter — On flat “K” 9.6mm Diameter — 0.25D flatter

  • 2.25 to 2.75D

    9.2mm Diameter — 0.25D steeper 9.6mm Diameter — on FLAT “K”

  • 3.00 to 3.50D

    9.2mm Diameter — 0.50D steeper 9.6mm Diameter — 0.25D flatter

  • Suggested Center Thickness

    Minus lens center thickness

  • Standard Design: Boston XO®

    Plano Lens Power — .18 -1.00 Lens Power — .17 -2.00 Lens Power — .16 -3.00 Lens Power — .15 -4.00 Lens Power — .14 -5.00 Lens Power — .13 -6.00 Lens Power — .13 -7.00 Lens Power — .13 -8.00 Lens Power — .13

  • Standard Design: Boston EO® & Boston ES®

    Plano Lens Power — .18 -1.00 Lens Power — .17 -2.00 Lens Power — .16 -3.00 Lens Power — .15 -4.00 Lens Power — .14 -5.00 Lens Power — .13 -6.00 Lens Power — .12 -7.00 Lens Power — .11 -8.00 Lens Power — .10

  • Thin Design: Boston EO® & Boston ES®

    Plano Lens Power — .15 -1.00 Lens Power — .14 -2.00 Lens Power — .13 -3.00 Lens Power — .12 -4.00 Lens Power — .10 -5.00 Lens Power — .10 -6.00 Lens Power — .10 -7.00 Lens Power — .10 -8.00 Lens Power — .10

  • Ultra Thin Design: Boston ES®

    Plano Lens Power — .14 -1.00 Lens Power — .13 -2.00 Lens Power — .12 -3.00 Lens Power — .10 -4.00 Lens Power — .08 -5.00 Lens Power — .08 -6.00 Lens Power — .08 -7.00 Lens Power — .08 -8.00 Lens Power — .08
Patient Information Booklet and Package Insert Patient Information Booklet and Package Insert (French) Professional Fitting Information
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Available in a wide variety of handling tints

Boston EO® Dk 58 • Boston ES® Dk 18 ISO/Fatt*

*ISO/Fatt Method: Dk Units = x 10-11 (cm3 O2 cm) / (cm2 sec mmHg) @ 35°C (see package inserts).

Learn more about the materials

Boston XO® & Boston XO2®
Boston® Equalens® II

The Boston® GP Lens Materials Guarantee

If you are not completely satisfied with any Boston® GP lens, you may exchange it for any other Boston® GP lens material.*

*THE BOSTON® GP LENS MATERIALS GUARANTEE IS AVAILABLE THROUGH PARTICIPATING AUTHORIZED BOSTON® MANUFACTURERS AND IS SUBJECT TO THE FOLLOWING TERMS AND CONDITIONS:

  1. The guarantee warrants against any Boston® lens material dissatisfaction related to wetting or breakability, and not lens design, for six months from the date the finished lens was dispensed.
  2. Under this guarantee, a Boston® lens can be exchanged only for another Boston® lens of the same parameters. Any add-ons, treatments or coatings are not included.
  3. Replacement of the same or other Boston® lens material will be shipped from the participating Authorized Boston® Manufacturer at published price. Credit for returned lens will be issued upon receipt of the returned lens accompanied by a copy of the original invoice. (Contact your Authorized Boston® Manufacturer for further details).