Abstract: A system is provided for the prevention of accidental needle pricks from the needle of a hypodermic syringe and for supporting the syringe in an upright disposition. A hypodermic syringe, having a conventional needle cap, is provided with a cap holder that includes both a suction cup and a sleeve having an open mouth and projecting upwardly therefrom. The suction cup is secured to a smooth surface by suction and the needle cap is inserted into the open mouth of the tube holder of the invention. Thereafter, with a single hand the hypodermic syringe can be capped by pushing the needle thereof into the needle cap, which is held stationary and stable by means of the cap holder. Preferably, the cap holder is provided with a retainer which may take the form of an elastic band secured relative to the cap holder sleeve.

Abstract: A progressive power ophthalmic lens is described on which one refractive surface is formed to provide zones at the top and bottom of the refractive surface having constant dioptric focal powers. The two zones having constant dioptric focal power are of different radii of curvature such that a near viewing zone is located at the bottom and a distance viewing zone is located at the top of the refractive surface. Between these two constant dioptric focal power zones lies an intermediate zone having progressive dioptric focal power within a range centered between the dioptric focal powers of the upper and lower zones. There is a downwardly positive discontinuity in the dioptric focal power at the boundary between at least one of the constant dioptric focal power zones and the intermediate zone having progressive dioptric focal power. This power discontinuity lowers the rate of addition of dioptric focal power through the progressive power intermediate zone.

Abstract: A progressive power ophthalmic lens is described on which one refractive surface is formed to provide zones at the top and bottom of the refractive surface having constant dioptric focal power. The two zones having constant dioptric focal power are of different radii of curvature such that a near viewing zone is located at the bottom and a distance viewing zone is located at the top of the refractive surface. Between these two constant dioptric focal power zones lies an intermediate zone having progressive dioptric focal power between the dioptric focal powers of the upper and lower zones. The intermediate zone makes a smooth optical connection to each of the other zones so that the refractive surface is continuous over its entire area.

Abstract: A multifocal ophthalmic lens is described on which one refractive surface is formed to provide a plurality of vertically juxtaposed viewing zones each of which has constant dioptric focal power. The constant dioptric focal power in the various zones increases successively from top to bottom of the multifocal ophthalmic lens. The refractive surface in the zones other than the viewing zone having the lowest focal power at the top of the lens is divided into a plurality of laterally disposed areas. In those areas near the periphery of the lens, the lens is provided with an aspheric surface formed from sections of a figure of revolution such that the principal axes of astigmatism lie in vertical and horizontal planes so that a wearer of the multifocal ophthalmic lens continues to perceive horizontal lines as being horizontal and vertical lines as being vertical and unbroken.