Many of our characteristics – our hair, skin, and eye colour – are passed down to us from our parents. Our parents can also pass down certain illnesses and diseases through our genes, and this can include our eyesight. Eyesight can be heavily influenced by genetics, while there are also environmental factors that can determine how good our eyesight will be. We may not be able to challenge our genetic predispositions, but we can follow a healthier lifestyle to ensure we prevent certain eye diseases as much as possible.