18+ Limbal Ring. So, why should we care? Transparent iris makes them prominent and vice versa.
Limbal rings' clarity fluctuates based on a series of factors including health and age.
Limbal rings are dark annuli encircling the iris that fluctuate in visibility based on health and age. A limbal ring is a dark ring around the iris of the eye. Most people are born with limbal rings, but as you age, your limbal rings typically become less visible. Limbal rings are the slightly darkened circles around our irises that become less defined as we age.