Cosmetic Cleansing Oil Absorption by Soft Contact Lenses in Dry and Wet Conditions.

OBJECTIVES: Previous reports showed that cosmetic cleansing oil for removing makeup, which contains mineral oil and surfactant, can deform some silicone hydrogel contact lenses (SHCLs) when applied directly to the lenses, although plasma-coated SHCLs (lotrafilcon A and B) were not affected. In the present study, we investigated hydrogel lenses and SHCLs in both wet and dry conditions. METHODS: Several brands of hydrogel and SHCLs were immersed in a cleansing oil solution containing Sudan Black B for 5 min under wet and dry conditions. The lenses under the wet condition were simply picked up from the saline, whereas those under the dry condition were blotted with paper wipes. After immersing, the excess solution remaining on the lenses was removed by finger rubbing with a multipurpose solution. The lenses were then examined using a stereomicroscope, and their mean brightness was measured and compared. RESULTS: The cosmetic cleansing oil was not absorbed by the hydrogel lenses under wet or dry conditions. However, four of seven brands of SHCLs absorbed the cosmetic cleansing oil under both conditions (dry and wet), whereas asmofilcon A absorbed it only under the dry condition. Lotrafilcon B and delefilcon A did not absorb cleansing oil even under the dry condition. CONCLUSIONS: Hydrogel lenses resist cosmetic cleansing oil. However, SHCLs have different degrees of resistance depending on the lens material. Some SHCLs absorbed cosmetic cleansing oil more under dry conditions than under wet conditions.

[The effect on the shape of color soft contact lens caused by pigments].

PURPOSE: To investigate the effect of the pigments in colored soft contact lenses (SCLs) on their shape and physical properties. METHODS: To make a comparison between clear SCLs and colored ones, we used SCLs made of the same materials and the same size and power, and are approved by the Japanese government. The shapes were evaluated in a saline solution by using a CL image viewer, and the sagittal depth was measured. In addition, we made fragments of SCLs and evaluated their shapes. The case we investigated the fitting pattern of the clear SCL was completely different from that of the colored ones on the same eye. Both lenses had the same parameters, were made of the same materials by the same manufacturer. RESULTS: There were significant differences in the sagittal depth between the clear and colored SCLs. When the fragments were made, the shapes of some colored SCLs reversed. This phenomenon was not seen in the clear SCLs. CONCLUSION: The shapes and fitting pattern of colored SCLs sometimes became different from the clear ones. Colored SCLs should be prescribed by ophthalmologists and checked regularly for problems.

Changes in the anterior and posterior radii of the corneal curvature and anterior chamber depth by orthokeratology.

PURPOSE: To investigate the mechanism of the refractive effect of orthokeratology by using measurements of the anterior and posterior radii of the corneal curvature and anterior chamber depth with a Pentacam analysis system. METHODS: Nine women (18 eyes) with a mean age of 29.6+/-3.8 years and low to moderate myopia (