title: Impact of Cosmetics on the Surface Properties of Silicone Hydrogel Contact Lenses.
abstract: OBJECTIVE
  This study evaluated the impact of various cosmetics on the surface properties of silicone hydrogel (SiHy) contact lens materials.
  
  
  METHODS
  In this in vitro experiment, 7 SiHy contact lens materials were coated with 1 of 9 cosmetics, including common hand creams (3), eye makeup removers (3), and mascaras (3). Dark-field microscopy images were taken to determine pixel brightness (PB) after cosmetic exposure, which describes the visible surface deposition (n=6 for each lens type), with a higher PB indicating increased deposition. The sessile drop technique was used to determine the advancing contact angle (CA). Measurements were repeated for both methods after a single peroxide-based cleaning cycle.
  
  
  RESULTS
  Pixel brightness was significantly higher for mascara-coated lenses compared with the other cosmetic products (P<0.01). The peroxide-based lens care solution removed most deposits from the nonwaterproof mascara for 4 lens types, whereas deposits remained relatively unchanged for 1 waterproof mascara (P>0.05). Hand creams and makeup remover had minimal impact on PB. Changes in CA measurements after cosmetic application were highly lens dependent. Hand creams caused primarily a decrease in CA for 5 of the 7 lens types, whereas 1 of the waterproof mascaras caused a significant increase of 30 to 50° for 3 lens types.
  
  
  CONCLUSIONS
  Some mascara-lens combinations resulted in increased CA and PB, which could have an impact on in vivo lens performance. Nonwaterproof mascara was mostly removed after a cleaning cycle. Further research is needed to understand the clinical implications for SiHy lens wearers using cosmetics.
authors.affiliation: Centre for Contact Lens Research, School of Optometry, University of Waterloo, Waterloo, ON, Canada.
authors.forename: Sruthi
authors.initials: S
authors.lastname: Srinivasan
authors.forename: Heinz
authors.initials: H
authors.lastname: Otchere
authors.forename: Mili
authors.initials: M
authors.lastname: Yu
authors.forename: Jeffery
authors.initials: J
authors.lastname: Yang
authors.forename: Doerte
authors.initials: D
authors.lastname: Luensmann
authors.forename: Lyndon
authors.initials: L
authors.lastname: Jones
mesh_terms: D003263:Contact Lenses, Hydrophilic; D003358:Cosmetics / Q000009:adverse effects*; D004209:Disposable Equipment; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D012828:Silicones; D063465:Skin Cream / Q000009:adverse effects; D013499:Surface Properties / Q000187:drug effects*
chemical_list: D003358:Cosmetics; D012828:Silicones; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate