If the selective pressure was carried out for long enough, it probably would make a difference. Racial variation in eyesight has been observed to exist: https:/

If the selective pressure was carried out for long enough, it probably would make a difference. Racial variation in eyesight has been observed to exist: https://www.ncbi.nlm.nih.gov/pubmed/7457480/ https://www.ncbi.nlm.nih.gov/pubmed/7457480/