[Is the staining grid usable? Investigation of the updated table in internet for cleaning solutions of the optometrist Gary Andrasko for usability].

The author presents the standards for testing the biocidal effectiveness of combined cleaning disinfection solutions (RDK solutions). By means of literature searches it was investigated whether the updated table of the optometrist Gary Andrasko in the internet is usable with respect to compatibility of combinations of commercially available contact lenses and commonly used RDK solutions by assessment of surface dye affinity. The methods used by Andrasko and the scientific basis of his approach are questioned based on various criteria and the value of the table is negated. The instructions for care given by the manufacturers of contact lenses are recommended.