Free form optimised single vision lenses

[DanLiv]

Free-form single vision lenses are more preferred as they provide high precision of free form surfacing which can produce lens surfaces over 100 times more accurate. Sophisticated lens design software employed in free form single vision lenses allow correction levels beyond corrective curve lenses. Free-form lenses also reduce glare and halo effects caused by light sources at night, such as car headlights.

some of this is true, some false, but all of it is pretty irrelevant to the benefits of free form optics. Sharpstick's original post and Robert's analysis are correct.