ToF-SIMS and AFM Characterization of Brown Cosmetic Contact Lenses: From Structural Analysis to the Identification of Pigments

Figure 4

Positive-ion ToF-SIMS spectra of cosmetic contact lens revealed the presence of the bulk polymer PHEMA at all surfaces of three lenses. (a) Noncolored part: (1) central clear zone. (b) Colored part: (2) front surface. (c) Colored part: (3) back surface.

(a)

(b)

(c)