Designed to make matches easier to watch for colour blind viewers who struggle to distinguish between the two colours, visiting teams have been asked to change kit when a colour match has been identified.
Colour blindness (colour vision deficiency, or CVD) affects approximately one in 12 men (8%) and one in 200 women.
Kit changes have been made to make matches easier to watch for colour blind viewers.
Ireland are therefore wearing white jerseys, rather than their traditional green, in Cardiff in round three under rules that are also expected to apply at the 2027 World Cup.
Wales and Ireland will no longer meet in their traditional red and green with the Six Nations announcing changes to their kit policy for 2025.
