A speculum (10) is provided herein which includes first (12) and second (14) arms, each having a channel (20) formed thereon adapted to the shape of an eyelid. A hinge (16) connects the first and second arms which permits the first and second arms to selectively rotate about an axis of rotation. The selective rotation causes the first and second channels to selectively move closer and farther apart. First (26) and second (28) elements are respectively located on the first and second arms, with the first and second elements being configured to cooperatively retain the first and second arms in select rotational positions with interfering interengagement between the first and second elements limiting rotation of the first and second arms. A slot (40) is defined in the second arm to partially separate a first portion (42) of the second arm from a second portion (44) of the second arm with the first portion being displaceable away from the second portion. The second element is located on the first portion. Advantageously, with this arrangement, the first portion acts as a spring-loaded hinge which applies not only biasing force to the second element for retention, but also permits the second element to be separable from the first element. The subject invention provides a mechanical feature beyond the inherent memory of the material for operation of the speculum.