Randomised controlled study comparing comfort-related outcomes between two rigid gas permeable (RGP) lenses with different sessile drop contact angles

Authors Hector Tello Manon , Marten Fortuin , John Schilperoort , David Edgar , Bruce Evans , Henri Kiers
Published in Ophthalmic and Physiological Optics
Publication date 2011
Research groups Lifestyle and Health
Type Article


To compare comfort‐related outcomes when wearing rigid gas permeable (RGP) contact lenses made of two different materials and using two cleaning regimes. In a double‐masked lens material cross‐over study, subjects (n = 28 who completed the study) were refitted with new lenses made from (A) Boston XO material in one eye and made from (B) ONSI‐56 material in the other eye. The lenses made from materials A and B were worn on the right eye and the left eye following the pattern AB–BA–AB (or vice versa) during the first, second, and third 5 week trial periods respectively. Miraflow cleaner (1st and 2nd period) was replaced by Boston Advance cleaner in the 3rd period. Comfort‐related outcomes were assessed by a numerical rating scale (NRS) after each period. Subjects rated six comfort‐related factors: satisfaction, sharpness of vision, end of day comfort, maximum comfortable wearing time, maximum wearing time and foreign body feeling. Additionally we obtained subjects’ preferences for type of lens and lens cleaner during an exit interview. The sessile drop method was used to measure static contact angles.


  • Henri Kiers | Researcher | Research group Lifestyle and Health
    Henri Kiers
    • Researcher
    • Research groups: Lifestyle and Health

Language English
Published in Ophthalmic and Physiological Optics
Year and volume 31 2
Key words asthenopia, contactlenzen
Page range 190-199