glass which comprises 0 2 to 2 by weight al 2 o 3 0 1 to 1 by weight li2o 0 3 in particular 0 4 to 1 5 by weight sb 2 o 3 60 to 75 by weight sio 2 3 to 12 by weight na 2 o 3 to 12 by weight k 2 o and 3 to 12 by weight cao the blank molded monolithic body comprises a light tunnel 108 which on its one side has a light entry face 101 and on another side passes or transits into a light passage guide or conductive section 109 of the blank molded monolithic body via a bend 107 curved in two spatial directions which section 109 has a light exit face 102 a light entry face 103 as well as a further light exit face 104 the headlight lens 100 is designed such that light entering the headlight lens 100 through the light entry face 101 and in the region of the bend 107 entering the passage section from the light tunnel 108 will exit from the light exit face 104 essentially in parallel to the optical axis 120 of the headlight lens 100 herein the light passage section 109 maps the bend 107 as a light or bright dark boundary a portion of the surface of the light passage section 109 facing the light tunnel 108 is designed as a petzval surface said surface portion having been designated by reference numeral 110 the headlight lens 10 includes a light source 11 designed as an led and a light.