Its not just ideal ratios

[bottleofwater]

Its also the fact that they have to be symmetrical, if you have good ipd/icd, yet ones further away to your nose than other, then you need to fix it, its jverlooked alot, good icd= good eye distancing, i have idela icd yet one of my eyes is further away from my nose to the other.

 

[bottleofwater]

Also IPD doesnt matter that much, your ICD mayters way more.

 

[Lord Shadow]

its more about how far are you from the ideal more than anything since there isn't any set in stone "perfect" ratio especially with every face being different - also race plays a role