Methods, traffic receivers, and computer readable storage media for testing network connections are disclosed. A speed of formation of a main portion of the sidewalls of the trench at the gate lead wiring region is greater than that of a main portion of the sidewalls of the trench at the cell region, so that a thickness of the oxide film at the gate lead wiring region is greater than that at the cell region. A processing unit converts the movement data detected into sewing data, which can be saved in a storage unit. The first and second pivot body arms include first and second knife edges, respectively, that are in line contact with the first and second grooves, respectively, of the pivot base such that the pivot body can pivot relative to the pivot base, as well as uniformly distribute unbalanced forces applied to the pivot body across the entirety of the knife edges. The cover can bear a decorative design so that the ophthalmoscope can be given a less threatening appearance when being used to examine the eyes of children.