Yep. Once your lenses get above -6 diopter or so it starts to become a serious concern. By -10 diopter it's the driving choice in lens material and design. At

Yep. Once your lenses get above -6 diopter or so it starts to become a serious concern. By -10 diopter it's the driving choice in lens material and design. At -10.5, -11 I always get relatively low refractive index (~1.5) CR-39 based lenses because it's Abbe number is 60. This means I can still read, say, street signs or flanking computer monitors out of the corner of my eye despite the light going through literally >1 cm of material.