iRo lenses are a range of 6 coordinated but varying lenses. They have been designed to fine tune the best colour rendition from those severely colour deficient to mild. The iRo kit gives samples of all 6 lenses in a ready to use kit to diagnose the best corrective lens for out of towners. The iRo lenses range from very dark, like a sunglass lens to very mild colour. They all have a varying base of red on top of which are added various multicoats which filter out different wavelengths of light. All lenses are 100UV blocking and will work both in and outside. Due to the density of colour the darker lenses in the series may be too dark to wear indoors unless very good lighting is available.