In one embodiment, the invention provides a test assembly for electrically connecting a test component to a testing machine for testing electrical circuits on the test component. The circuit is operative to control functionality of the LED driver circuit based on a firing angle from a power switch. A ferrule mounted between the nut and the tube is forced to plastically deform and move into the notch to thereby seal the tube end. The compacting mechanism further comprises a ratchet mechanism for releasably locking the actuating rod against movement upwardly through the aperture in the lid such that refuse in the container can be compacted by force applied to an edge of the lid opposite the hinge. The structure is more compact, neater in appearance, and of improved quality as compared to eyeglasses incorporating conventional structures, and is less expensive to manufacture than many conventional eyeglasses, especially in large volume. Determination of the error metric may comprise dividing the image into a plurality of sections, assigning a plurality of importance values to the plurality of sections, and calculating the error metric based on the plurality of importance values.