Abstract: A vision testing apparatus has a frame including a face plate with at least one eye shield having a viewing slot positioned in a viewing direction perpendicular to the face plate, at least one variable lens element including an outer rail and multiple regions of varying diopter power having a width that is equal to or greater than the width of the viewing slot of the eye shield, and adjustable controls for moving the variable lens element in a direction perpendicularly to the viewing direction along a plane of the face plate. The testing apparatus is portable and can be used in developing nations where visual acuity is not corrected because of lack of access to optometric care.

Abstract: A vision testing apparatus has a frame including a face plate with at least one eye shield having a viewing slot positioned in a viewing direction perpendicular to the face plate, at least one variable lens element including an outer rail and multiple regions of varying diopter power having a width that is equal to or greater than the width of the viewing slot of the eye shield, and adjustable controls for moving the variable lens element in a direction perpendicularly to the viewing direction along a plane of the face plate. The testing apparatus is portable and can be used in developing nations where visual acuity is not corrected because of lack of access to optometric care.

Abstract: A vision testing apparatus is disclosed. The apparatus has a frame comprising a face plate with at least one eye shield having a viewing slot positioned in a viewing direction perpendicular to the face plate, at least one variable lens element including an outer rail and multiple regions of varying diopter power having a width that is equal to or greater than the width of the viewing slot of the eye shield, and adjustable controls for moving the variable lens element in a direction perpendicularly to the viewing direction along a plane of the face plate. The testing apparatus is portable and can be used in developing nations where visual acuity is not corrected because of lack of access to optometric care.

Abstract: A vision testing apparatus is disclosed. The apparatus has a frame comprising a face plate with at least one eye shield having a viewing slot positioned in a viewing direction perpendicular to the face plate, at least one variable lens element including an outer rail and multiple regions of varying diopter power having a width that is equal to or greater than the width of the viewing slot of the eye shield, and adjustable controls for moving the variable lens element in a direction perpendicularly to the viewing direction along a plane of the face plate. The testing apparatus is portable and can be used in developing nations where visual acuity is not corrected because of lack of access to optometric care.

Abstract: The present invention discloses a method for signal concatenation. The method inputs signals from other signal device to a first signal device and outputs the signals from the first signal device after processed by the first signal device, comprises the steps of: establishing a connection between the first signal device and the other signal device; inputting the signals outputting from the other signal device to the first signal device; processing the input signals by the first signal device; and outputting the processed signals to an external device by the first signal device.

Abstract: The present invention discloses a multilayer controlling system of data transfer and the method using thereof. The disclosed multilayer controlling system is used for controlling data to transfer from a service operator to pluralities of clients. The system comprises a remote server, at least one intermediate server and pluralities of set-top boxes. The remote server is disposed at the service operator and connects with the intermediate server via a first network interface to take the initiative in transferring the data to the intermediate server. The set-top boxes are disposed at the clients, and the intermediate server connects with the set-top boxes via a second network interface to take the initiative in transferring the date to the set-top boxes. Each of the set-top boxes has a first storage unit, and the data are stored in the first storage unit of each set-top box.

Abstract: An interactive television service system for providing personalized advertising message is provided, which connects to at least one set-top box by a network. The system includes a back-end interactive television server and an advertising message management module. The back-end interactive television server connects to the set-top box through the network, to transmit one of the interactive video program lists and one of the interactive video service contents to the set-top box. The advertising message management module is connected to the back-end interactive television server to store, manage or send one or more advertising messages, so when the back-end interactive television server transmits the interactive video program list and interactive video service contents, the back-end interactive television server retrieves at least one of the related advertising messages from the advertising message management module to the set-top box.

Abstract: The invention relates to soft contact lenses having a water content of at least about 45% and comprising a hydrated copolymer of a major proportion of an hydroxyalkyl acrylate or methacrylate, up to 12% by weight of an ethylenically unsaturated acid or anhydride, a minor proportion of a cross-linking monomer and a minor proportion of styrene or a substituted styrene, the free acid or anhydride groups being in salt form.

Abstract: A method of manufacturing a contact lens by machining a lens blank in a suitable machinable condition. The concave lens surface is machined first and the circumferential edge surface is then machined with the blank mounted in the same position. The partly formed blank is repositioned and the convex lens surface machined.

Abstract: A hydrophilic terpolymer suitable for manufacture into shaped articles, said terpolymer being substantially the polymerization product of hydroxyalkyl acrylate or methacrylate, a vinyl comonomer having a high affinity for water, e.g. N-vinyl pyrrolidone, and a polymerizable, unsaturated carboxylic acid, e.g. methacrylic or acrylic acid. The terpolymer is particularly adaptable for use as a contact lens by bringing it in contact with a buffered aqueous alkaline solution thereby affording a hydrogel having a water content between about 55-85% by weight of the total.A preferred embodiment of the invention is the polymerization product of a reaction mixture comprising 30-50% by weight of vinyl pyrrolidone, up to about 3% of a crosslinking agent such as ethylene glycol di-methacrylate, methacrylic acid amounting to about 0.25--3.5% by weight, and 2-hydroxyethyl methacrylate which constitutes the balance.