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1. Eyeglasses comprising: a front frame with a lens-holding rim (3) having an open contour perimeter profile, said lens-holding rim including an upper rim portion (6) and a lower rim portion (7) which extend to surround the profile of a lens (4) intended to be held on the lens-holding rim (3) and which bear respective free ends (6a, 7a) facing one another in the open area of the perimeter profile of the rim (3), an endpiece (8) connecting a respective rod (9) to the lens-holding rim (3), the endpiece (8) is coupled rotatably to the lower portion (7) of the lens-holding rim about a first pivot axis (Y1) and is coupled rotatably to the upper portion (6) of the lens-holding rim (3) about a second pivot axis (Y2), said first and second pivot axes (Y1, Y2) being parallel to one another and the first pivot axis (Y1) being laterally spaced from the second axis (Y2) on the side facing the rod (9), the endpiece (8) being thus configured to rotate about said first and second pivot axes (Y1, Y2) between a closed position and an open position of the lens-holding rim (3), in order, respectively, to move the upper (6) and lower (7) rim portions closer to each other or away from each other, at their respective free ends (6a, 7a), and retaining means and counter-retaining means between the side endpiece (8) and the upper portion (6) of the lens-holding rim, said retaining means and counter-retaining means cooperate with one another in the closed position in order to hold said upper and lower portions of the lens-holding rim (3) therebetween, said retaining means and counter-retaining means comprise a protuberance (18) on one of either the endpiece or the upper rim portion and a respective recess (19) on the other of either the endpiece or the upper rim portion, the protuberance (18) being configured to engage the recess (19), to fit substantially within the recess in the closed position, for the relative mutual retention between said upper (6) and lower (7) portions of the lens-holding rim (3).
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