This invention provides for anti-glare eyeglasses comprising a frame and two hinged armø to be used by drivers in night driving.

.- There haire been-know -anti-glare eyeglasses,for use in night driving which prevent driver blindness by using polarized light,..Their, major .shortcoming.liβs-in that polarized- light is seldom used with .motor cars. Other anti¬ glare eyeglasses, shielding car drivers against-the glare .of the. headlights of on-coming vehicles make use of coloured filtering shields~in.~shape._Of a cone.,or-frus.trum.-of- cone or half sphere or any Other shape easily adaptable to the eyesight. Their- disadvantage is due to a decrease in .the visual perception of areas outside,the dazzling portion.

The above-men ioned-.shortcomings-are eliminated by the anti-glare eyeglasses- made according to this invention which-in order to prevent the-driver from being blinded-by the-glare of-the headlights-,of on-coming . vehicles i_a*e--been-provided with a number of-.sights having a plane surface with a ciroular opening around which a frustru of a cone is fixed having a base-angle of 15 to 85 degrees and a. base area of a size identical to tha -of the cirαulεr opening and a top area continued by,a cylinder the end of which provides a ciroular vision area.

By wearing he anti-glare eyeglasses of his invention.the drivers can fully avoid blindness due to the headlights of ϋ_β on-coming vehicles while permanently keeping the road «βy under observation.

In one preferred aspect the anti-glare eyeglasses of this invent ion σ aft be described according to the following figures 1 . . . which represent :

_5 front view of the anti-glare eyeglasses j view of left and right sights of the anti¬ glare eyeglasses _? cross-section of a sight ; ₀ sketch tie» of sight in an optical field .

The anti-glare eyeglasses of this invention c omprise a frame 1 with a vertical edge A a horizontal base B and a yoke 0 which is continued at its upper end

4.5 by a strength element D. The inner edge of the frame has a groove 1. A hinge and an eyeglass arm (not represented in the figure because tbey are already known per se) are fixed βnto the Bight and left side of the upper part of edge A .

50 sight 2 enters the -groove E; the plane area of the sight takes after the shape of the eyeglasses. Said plane area F provides for a circular opening G. The distance in-between the centre of this circular- opening 5 and the centre of the G opening of the next sight corresponds to the interpupilar distance of the driver's eyes. A frustru of a cone 3 is attached to the circum¬ ference of the opening S; the frustrum of a cone has a big base Ξ and a small base I, a side surface J O continued from the small base I by a cylinder 4- provid¬ ing s circular vision area __ at its distal end.

The sight 2 is made of s transparent _ioterisl

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70 which, diminishes the effec -of the light co ing onto i-ts surface by usinr _. the refraction of - the .light rays. Both the frustrum of a cone 3 and the cylinder 4 are. made of the same- transparent. material so that" he intensity of -- the light .rays coming on to that ayeg be not .altered. The 75 angle between the side surface J i.e. its .generatrix and big radius H aries from 15 to 85 degrees.

-U on- using the anti-glare eyeglasses- of — this - invention^s-t night, the- light rays of the headlights of

80 the on-coming- vehicles fall .χ»nto -he -side surface J.-of... the-frustrum of cone- .3 and are reflected-in such-s-manner that the driver's eyesight is not affeflted as. he sees through the -cylinder 4 and the vision area __»■ As- -the -plane surface 2- is made of a- transparent material which diminishes

85 the effect of the light of -the headlights will peroepie - as side light spots while eyes can look right-ahead seeing every detail of the roadway through the vision area E.

. Whenever the glare of the head lights ar off

90 beαo es -damaging. the driver must simply turn his. head _* slightly to the apposite- side - to avoid blindness-i.e. while placing the-left edge of the. vision area 1 tangent to the left headlight of the on-coming vehicle (Fi .4)

95