The Karthala White-eye is tied to montane heath on Mount Karthala, Grand Comoro. It moves in energetic flocks and has a narrow white eye-ring and yellow underparts.
A small, sharp-billed bird with yellow underparts and a narrow white eye-ring. The profile describes it as slightly larger and duller olive-green than Kirk's White-eye, especially below and above the bill.
It travels in hyperactive flocks in montane heath on Mount Karthala. Its song is a quiet series of low notes; calls include rattles and high whistles.
An extinction-risk assessment has not been added yet.