Dubbed the "silent thief of sight" because it can creep in unnoticed, people are being warned it can lead to permanent vision loss if left untreated - and seeing rings around lights is an early sign.

Glare is more of a condition where a patient's vision is reduced or affected by light. Halos are a physical appearance of just a ring around lights that ... what's causing the halo.

Dubbed the "silent thief of sight" because it can creep in unnoticed, people are being warned it can lead to permanent vision loss if left untreated - and seeing rings around lights is an early sign.