depends on how old they are, chickens usually reduce production in their second year I think. Others can give you a more knowledgeable answer that I am sure you will get but I would find out their age before I bought them if it was me. RIR are great layers BTW and if they are a year or younger that is a deal.
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Don't worry. A lot has to do with how much sunlight they are getting to the retina of the eye....it triggers hormones.
My hens are in their second year of laying and are producing as well as in the first year.