> Myopia is somewhat genetic That conclusion is can't be supported from the above fact alone. It could be a development disorder with a certain probability of

> Myopia is somewhat genetic That conclusion is can't be supported from the above fact alone. It could be a development disorder with a certain probability of occurrence given other non-genetic factors. Perhaps some pre-industrial people didn't get enough sun time, because they spent too time at home reading. Others had physical eye damage from work activities, etc.