The comments about shape of design and lenticular astigmatism are way out there.
To address the lenticular astigmatism, marginal astigmatism and power error are effects of the lens system. Best form is designed to reduce/eliminate these lens errors. Corneal/lenticular astigmatism is a fuction of the eyes optics. As long as the eye is rotating behind the eyeglass lens a best form is going to attempt to provide stigmatic power in points across the lens surface so the clarity should remain the same throughout a wider portion of the lens.
A compensated prescription is attempting to provide a localized power in a tilted system compared to the untilted refractive power found during refraction. These formulas are fairly well documented and accepted.
Now with that background a compensated design is an attempt to merge best form and compensation in essence together. So rather than focusing on a localized power error the focus is on a wider portion of the lens compensated to provide clarity.
The poster may be talking about a compensated prescription instead of a compensated design, which is comparing apples to oranges. Thats why the message is giving me a headache, this thread isnt really discussing anything in particular just the frustration with the lack of understanding of what type of lens is being fit. Unfortunately without the particular lens design in question how can any reply be of any use.
Bookmarks