Device for use in eyesight testing

A device for use in testing eyesight for the purpose of possibly finding short-sightedness, long-sightedness, etc., in the form of a simple means, a so-called eyesight tester, comprising a number of lenses (34, 34a) of different refractive powers, which may be brought by an ocular device (36;

• 38) into position in front of the eye to be tested, said device further comprising a support (10,12) including two support parts (10 and 12) each formed for rotationally supporting at least one wheel (for example 24b) of a preferably round circumference, along, which said lenses (34, 34a) are positioned, distributed along at least one imaginary circle, said ocular device (36;
• 38) being located on this imaginary circle, so that one lens (34, 34a) of a respective wheel (24, 24b) at a time is positioned within said ocular device (36;
• 38) by stepped turning of said wheel, and wherein provisions have been made to make visible a lens power indication (for example −3) on the wheel corresponding to the lens (34a) or mutually overlapping lenses appearing simultaneously within the ocular (36;
• 38), said lens power indications being carried by the respective wheel, preferably distributed along imaginary circles, characterized in that said two parts (10 and 12) of the eyesight tester support (10,12) are hinged together, said hinge (22) exhibiting such flexibility as to allow the support (10,12) to be folded about the hinge axis to occupy a double folded, inoperative position, in which the two support parts (10 and 12) overlap one another.