Abstract: An apparatus and method for converting a non-rotatably diagnostic lens into a rotatable device for evaluation of various portions of the eye wherein the lens device includes a housing member having opposed end portions and associated wall portions, a viewing lens positioned adjacent one end portion of the housing member and at least one mirror or other viewing surface located adjacent thereto, the improvement comprising a groove formed in the outer periphery of the housing member and a peripheral member cooperatively engageable with the groove, the peripheral member being shaped and dimensioned such that the housing member is rotatably movable relative to the peripheral member when the peripheral member is engaged with the groove. This arrangement enables a user to hold the peripheral member stationary and thereafter rotate the entire lens device so as to selectively position the at least one mirror or other viewing surface at the appropriate eye location for ocular evaluation.