face and a light tunnel having at least one optically operative light entry face the light tunnel transits into the light passage section via a bend being curved in its longitudinal extension wherein the light tunnel at the bend has a smaller cross section than the light passage section at the bend and wherein the light passage section is configured for imaging the bend as a bright dark boundary application_number US 201715499265 A description fig1 shows an example of embodiment of a motor vehicle 1 including a motor vehicle headlight 10 fig2 shows a side view of the motor vehicle headlight 10 having a headlight lens 100 but without a housing fittings and energy supply with the headlight lens 100 being represented in fig3 in a cut out manner by way of a perspective bottom view view from below the headlight lens 100 comprises a monolithic body of inorganic glass in e g 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.