The eyes of the common European mole are reduced and do not function, however

The eyes of the common European mole are reduced and do not function, however, some species of moles living in the mountains have vision. How can this be explained?

1) Reduced eyes in the European mole arose as an adaptation to constant presence in the soil environment – there is simply no need for good vision, so it was lost, and in return the animal received other adaptations for such a lifestyle.

2) Moles living in the mountains retain their sight, because in the mountainous area the soil is hard enough, so they have to stay on the surface for a long time. To navigate in sunlight, eyes are needed, so they are not reduced in mountain moles.