- correction range of -4.5 to +4.5 diopter
 - iris
 - 48 colour combinations in two rings of six colours
 - can be used as one or other bank of six colours: 
  
 - wheel (nearest eye): pale yellow, avocado green, orange, brown, dark or light grey
 - wheel: light blue, dark blue, lemon yellow, red, light green and lilac
 
 
 - colours from one ring can be mixed with the other - to provide the remaining 36 colour options
 - can be used as an iris only
 - each engraved with its own number
 - supplied with 5 external push-fit rubber rings
 
 
 
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