Abstract: A test pattern (170) comprising a set of dots (174) which define a first ellipse (176) of best fit in which the major and minor axes R1, R2 are equal (i.e. a circle) is displayed on a plane surface and a digital image of the (usually distorted) test pattern seen through a lens is captured. A second ellipse of best fit joining the dots in the set is derived from the distorted test pattern in the image. Characteristics of the first and second ellipses are compared to determine the degree and nature of distortion to the test pattern, from which the power of the lens is calculated. The major and minor axes of the first and second ellipses may be compared. The test pattern can include a number of said sets of dots distributed over an area of the surface with each set being analysed to determine the optical parameters of the lens at multiple locations.

Abstract: A technology is described for generating sensory effects linked to virtual objects. In one example, a virtual object associated with a sensory attribute can be generated in a virtual reality environment. The virtual object may be associated with a sensory attribute which can be simulated using a defined sensory input generated by a sensory rendering device. A virtual object position can be determined for the virtual object relative to a virtual user position for a virtual user in the virtual reality environment. One or more sensory rendering devices can be identified to generate the defined sensory input, and the one or more sensory rendering devices can be activated to generate the defined sensory input.

Abstract: A test pattern (170) comprising a set of dots (174) which define a first ellipse (176) of best fit in which the major and minor axes R1, R2 are equal (i.e. a circle) is displayed on a plane surface and a digital image of the (usually distorted) test pattern seen through a lens is captured. A second ellipse of best fit joining the dots in the set is derived from the distorted test pattern in the image. Characteristics of the first and second ellipses are compared to determine the degree and nature of distortion to the test pattern, from which the power of the lens is calculated. The major and minor axes of the first and second ellipses may be compared. The test pattern can include a number of said sets of dots distributed over an area of the surface with each set being analysed to determine the optical parameters of the lens at multiple locations.

Abstract: A system (101) for examining lenses in a pair of glasses includes a tablet computer (112), a camera (128) mounted above the computer screen and a glasses mount (156) for holding a lens in a pair of glasses between the camera and the display screen. The camera (128) is operatively connected to the computer for storing and processing image data captured by the camera. In use, a test pattern is displayed on the screen below the camera and an image of the test pattern seen through a lens is captured by the camera. Image data is saved to the computer which processes the data to determine the power of the lens from the distortion to the test pattern caused by the lens. The results are displayed on another section of display screen. The camera mount (156) may be a plinth slidably positioned on the display screen.

Abstract: A composition for retarding water loss and/or heat loss from a body of water comprises a polyoxyethylene ether having the general structure of R—(OCH2CH2)nOH where R is an alkyl group or mixture of alkyl groups, and n is the average number of ethylene oxide units in the polyethylene glycol segment, wherein R is lauryl alcohol and n is 2. The composition can be delivered as a neat liquid, solution, or dispersion in a solvent or carrier, without additional dispersants or spreading agents, and without hazardous or flammable solvents. Embodiments may include a thickening agent to stabilize the dispersion until use. Preservatives, colorants and fragrance can be added. The range for delivery of the composition in dilution is from about 0.1% to about 90% by weight in one embodiment, and from about 0.5% to about 50% by weight, and from about 1% to about 20% by weight in other embodiments.

Abstract: Provided herewith is a transparent candle made substantially of tetraesters of di (trimethylolpropane).

Abstract: A composition for retarding water loss and/or heat loss from a body of water comprises a polyoxyethylene ether having the general structure of R—(OCH2CH2)nOH where R is an alkyl group or mixture of alkyl groups, and n is the average number of ethylene oxide units in the polyethylene glycol segment, wherein R is lauryl alcohol and n is 2. The composition can be delivered as a neat liquid, solution, or dispersion in a solvent or carrier, without additional dispersants or spreading agents, and without hazardous or flammable solvents. Embodiments may include a thickening agent to stabilize the dispersion until use. Preservatives, colorants and fragrance can be added. The range for delivery of the composition in dilution is from about 0.1% to about 90% by weight in one embodiment, and from about 0.5% to about 50% by weight, and from about 1% to about 20% by weight in other embodiments.

Abstract: Provided herewith is a transparent candle made substantially of tetraesters of di (trimethylolpropane).

Abstract: Provided is a transparent candle comprised substantially of tetraesters of di(trimethylolpropane)