From glancing at the edges of my glasses, about 160-180 degrees, but anything close to the edges is always blurry; there's no way to avoid some level of lensing

From glancing at the edges of my glasses, about 160-180 degrees, but anything close to the edges is always blurry; there's no way to avoid some level of lensing error. (Barring contacts.) I've always favored extra-wide glasses, though. Some of the smaller ones might be 140 or even 120 degrees.