35% of people say that they have their eyes tested at least once a year, 37% every two years, 17% less than every two years, and 8% say they have never had their eyes tested.
Dywed 35% o bobl eu bod yn cael prawf llygaid o leiaf unwaith y flwyddyn, 37% bob dwy flynedd, 17% yn llai na phob dwy flynedd, ac mae 8% yn dweud nad ydynt erioed wedi cael prawf llygaid.