Abstract: A device for automatically measuring the spherical power, cylindrical axis and power and prism of an ophthalmic lense, with each determined independently of each other without a servo system. At least two LEDs act as point-sources of light, as Scheiner apertures. The light from the LEDs pass through an objective lense, thence through a selectively translatable aperture target, and then pass through a collimating lense. The LED rays then pass through the lens under study, and the target images are focused by a telescope objective lens onto a light sensitive detector. The detector which is selectively rotatable in concert with the LEDs is partitioned into Cartesian quadrants. Rotation of the detector and LEDs until the target images fall on the major detector axis discloses the axis of the cylinder of the lens being measured independent of lens power. Translation of the target until the target images maximally coincide reveals the power of the lens in its principal meridian.

Abstract: An advertising message is placed upon the planar surface of a thin negative lens, preferably of fresnelled construction. The lens is, in turn, placed upon a window, preferably a store front window affording a view to a background merchandising display. When viewed by passersby (preferably pedestrian traffic), differential angular movement of the store front display in the negative lens to the store front display out of the negative lens results. This causes differential apparent angular motion to the viewer and draws immediate attention to the lens and its message. For store front traffic passing relatively close to the window, both the display and the message as viewed by the passersby become simultaneously visible due to two effects. First, the negative fresnelled lens makes the display (as viewed through the lens) and the message appear with a minimum depth of field differential.