Performance of a color indicator in a disinfecting solution for the maintenance of soft contact lenses.
An experimental study of Allergan's Oxysept Comfort system was performed by measuring the slight reddish hue that appears in the disinfecting solution, indicating to the users that their lenses are again ready to be worn. The temporal evolution of the color of the solution has been measured under standardized conditions and analyzed in the CIELAB system, from the perspective of the typical threshold discrimination of the human eye. Color differences between neutralized and non-neutralized solutions occurred in an appropriate direction of the color space to enhance discrimination and were clearly perceptible by normal observers (greater than 9.7 +/- 1.2 CIELAB units). Colorimetric analyses have been used to draw conclusions regarding observers with defective color vision. The color of the solution changes abruptly, approximately 25 min after the neutralization process begins, and remains nearly constant after about 60 min, this agreeing well with the temporal evolution of the hydrogen peroxide concentration.
Melgosa
M
M
Departamento de Optica, Facultad de Ciencias, Universidad de Granada, España. mmelgosa@goliat.ugr.es
Hita
E
E
Velasco
M J
MJ
D003116:Color; D003124:Colorimetry; D018639:Contact Lens Solutions / Q000737:chemistry*; D003263:Contact Lenses, Hydrophilic; D006801:Humans; D006861:Hydrogen Peroxide / Q000032:analysis*; D007202:Indicators and Reagents / Q000737:chemistry*; D015588:Observer Variation; D013053:Spectrophotometry
D018639:Contact Lens Solutions; D007202:Indicators and Reagents; D006861:Hydrogen Peroxide