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Scanning Electron Microscopy Findings With Energy-Dispersive X-ray Investigations of Cosmetically Tinted Contact Lenses.

Hotta F, Eguchi H, Imai S, Miyamoto T, Mitamura-Aizawa S, Mitamura Y - Eye Contact Lens (2015)

Bottom Line: We analyzed the surfaces and principal elements of the colorants of five commercially available Cos-CLs using scanning electron microscopy with energy-dispersive x-ray analysis.In the other lens, colorants were found in the most superficial layer on the posterior surface, although a coated layer was observed.Colorants may be deposited on the lens surface and consist of an element that has tissue toxicity.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology (F.H., H.E., T.M., S.M.-A., Y.M.), Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan; and Division of Chemistry (S.I.), Institute of Socio-Arts and Sciences, The University of Tokushima, Tokushima, Japan.

ABSTRACT

Objective: To investigate the surfaces and principal elements of the colorants of cosmetically tinted contact lenses (Cos-CLs).

Methods: We analyzed the surfaces and principal elements of the colorants of five commercially available Cos-CLs using scanning electron microscopy with energy-dispersive x-ray analysis.

Results: In two Cos-CLs, the anterior and posterior surfaces were smooth, and colorants were found inside the lens. One lens showed colorants located to a depth of 8 to 14 μm from the anterior side of the lens. In the other lens, colorants were found in the most superficial layer on the posterior surface, although a coated layer was observed. The colorants in the other three lenses were deposited on either lens surface. Although a print pattern was uniform in embedded type lenses, uneven patterns were apparent in dot-matrix design lenses. Colorants used in all lenses contained chlorine, iron, and titanium. In the magnified scanning electron microscopy images of a certain lens, chlorine is exuded and spread.

Conclusions: Cosmetically tinted contact lenses have a wide variety of lens surfaces and colorants. Colorants may be deposited on the lens surface and consist of an element that has tissue toxicity.

No MeSH data available.


Related in: MedlinePlus

Scanning electron microscopy views and energy-dispersive x-ray mapping analysis of 1-DAY ACUVUE DEFINE. (A) The surface of the eyelid side is smooth. (B) The surface of the corneal side is also smooth. (C) The cross section reveals that the colorants are located to a depth of 8 to 14 μm from the eyelid side of the lens. (D) The main component of the colorants is iron.
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Figure 1: Scanning electron microscopy views and energy-dispersive x-ray mapping analysis of 1-DAY ACUVUE DEFINE. (A) The surface of the eyelid side is smooth. (B) The surface of the corneal side is also smooth. (C) The cross section reveals that the colorants are located to a depth of 8 to 14 μm from the eyelid side of the lens. (D) The main component of the colorants is iron.

Mentions: The lens had a smooth surface on both sides (Fig. 1A,B). In the cross-sectional image, the colorants were found embedded inside the lens to a depth of 8 to 14 μm from the anterior surface (Fig. 1C,D).


Scanning Electron Microscopy Findings With Energy-Dispersive X-ray Investigations of Cosmetically Tinted Contact Lenses.

Hotta F, Eguchi H, Imai S, Miyamoto T, Mitamura-Aizawa S, Mitamura Y - Eye Contact Lens (2015)

Scanning electron microscopy views and energy-dispersive x-ray mapping analysis of 1-DAY ACUVUE DEFINE. (A) The surface of the eyelid side is smooth. (B) The surface of the corneal side is also smooth. (C) The cross section reveals that the colorants are located to a depth of 8 to 14 μm from the eyelid side of the lens. (D) The main component of the colorants is iron.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4561626&req=5

Figure 1: Scanning electron microscopy views and energy-dispersive x-ray mapping analysis of 1-DAY ACUVUE DEFINE. (A) The surface of the eyelid side is smooth. (B) The surface of the corneal side is also smooth. (C) The cross section reveals that the colorants are located to a depth of 8 to 14 μm from the eyelid side of the lens. (D) The main component of the colorants is iron.
Mentions: The lens had a smooth surface on both sides (Fig. 1A,B). In the cross-sectional image, the colorants were found embedded inside the lens to a depth of 8 to 14 μm from the anterior surface (Fig. 1C,D).

Bottom Line: We analyzed the surfaces and principal elements of the colorants of five commercially available Cos-CLs using scanning electron microscopy with energy-dispersive x-ray analysis.In the other lens, colorants were found in the most superficial layer on the posterior surface, although a coated layer was observed.Colorants may be deposited on the lens surface and consist of an element that has tissue toxicity.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology (F.H., H.E., T.M., S.M.-A., Y.M.), Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan; and Division of Chemistry (S.I.), Institute of Socio-Arts and Sciences, The University of Tokushima, Tokushima, Japan.

ABSTRACT

Objective: To investigate the surfaces and principal elements of the colorants of cosmetically tinted contact lenses (Cos-CLs).

Methods: We analyzed the surfaces and principal elements of the colorants of five commercially available Cos-CLs using scanning electron microscopy with energy-dispersive x-ray analysis.

Results: In two Cos-CLs, the anterior and posterior surfaces were smooth, and colorants were found inside the lens. One lens showed colorants located to a depth of 8 to 14 μm from the anterior side of the lens. In the other lens, colorants were found in the most superficial layer on the posterior surface, although a coated layer was observed. The colorants in the other three lenses were deposited on either lens surface. Although a print pattern was uniform in embedded type lenses, uneven patterns were apparent in dot-matrix design lenses. Colorants used in all lenses contained chlorine, iron, and titanium. In the magnified scanning electron microscopy images of a certain lens, chlorine is exuded and spread.

Conclusions: Cosmetically tinted contact lenses have a wide variety of lens surfaces and colorants. Colorants may be deposited on the lens surface and consist of an element that has tissue toxicity.

No MeSH data available.


Related in: MedlinePlus