I get the pun, but you highlight a potentially assumed unnecessary absence of additional cohorts - how does this effect people who are blind, both blind from bi

I get the pun, but you highlight a potentially assumed unnecessary absence of additional cohorts - how does this effect people who are blind, both blind from birth and those that have lost their sight at some period of their life, and for a select period of time. Are we to assume that this study excludes these two additional cohorts, and if so why or how has that been established?