A supply circuit for supplying a light-emitting element includes a voltage regulator having a voltage output for outputting an output voltage and having a control input for regulating the output voltage based on a voltage at a divider node of a voltage divider. A first and a second terminal are used to connect the light emitting element, the first terminal being coupled to the voltage output and the second terminal being coupled to a reference potential terminal via a series resistor. The supply circuit further includes a control block having an analog-to-digital converter for generating a digital voltage feedback value from a voltage applied to the second terminal, a control element, and a digital-to-analog converter coupled to the divider node for outputting an analog control signal based on a digital control value. The control element is arranged to compare the voltage feedback value with a reference feedback value, if the voltage feedback value is less than the reference feedback value, to change the control value in a first direction, and if the voltage feedback value is greater than the reference feedback value, to change the control value in a second direction.

A supply circuit for supplying a light-emitting element includes a voltage regulator having a voltage output for outputting an output voltage and having a control input for regulating the output voltage based on a voltage at a divider node of a voltage divider. A first and a second terminal are used to connect the light emitting element, the first terminal being coupled to the voltage output and the second terminal being coupled to a reference potential terminal via a series resistor. The supply circuit further includes a control block having an analog-to-digital converter for generating a digital voltage feedback value from a voltage applied to the second terminal, a control element, and a digital-to-analog converter coupled to the divider node for outputting an analog control signal based on a digital control value. The control element is arranged to compare the voltage feedback value with a reference feedback value, if the voltage feedback value is less than the reference feedback value, to change the control value in a first direction, and if the voltage feedback value is greater than the reference feedback value, to change the control value in a second direction.

A device for variable polarization by an illumination device for illuminating organic tissue. The device includes a first set of one or more light emitting diodes (LEDs), a first polarizer arranged to polarize light emitted from the first set of LEDs in a first polarization direction, a second set of one or more LEDs, a second polarizer arranged to polarize light emitted from the second set of LEDs in a second polarization direction. A lens is arranged to collect light from organic tissue illuminated by the first and/or second sets of LEDs including a viewing polarizer arranged to polarize the light collected from the organic tissue in the second polarization direction. A signal generator is operable to signal one or more drivers for driving one of the first and second sets according a signal value and driving the other of the first and second sets according to an inverse value thereof.

A user-wearable fluorescence based visualization system comprising a multi-light lamp assembly that provides for the selected output of light using multiple light emitting sources, wherein the outputted light may be tailored to generate response wavelength by the interaction of the emitted light and a tissue illuminated by the emitted light, through the process of fluorescence, and a viewing system that allows a practitioner view the fluorescent light generated by the tissue, and distinguish between healthy and diseased tissues.

A user-wearable fluorescence based visualization system comprising a multi-light lamp assembly that provides for the selected output of light using multiple light emitting sources, wherein the outputted light may be tailored to generate response wavelength by the interaction of the emitted light and a tissue illuminated by the emitted light, through the process of fluorescence, and a viewing system that allows a practitioner view the fluorescent light generated by the tissue, and distinguish between healthy and diseased tissues.

A magnifying cap for a prescription bottle is disclosed. The cap has a magnifying lens retained within the cap between a top aperture and an opening at the bottom end. The magnifying lens is oriented to provide a magnification of indicia carried on an outer surface of the prescription bottle, when viewed through the aperture and the opening. An illumination source may be provided around a periphery of the magnifying lens to illuminate the indicia for better viewing.

A magnifying cap for a prescription bottle is disclosed. The cap has a magnifying lens retained within the cap between a top aperture and an opening at the bottom end. The magnifying lens is oriented to provide a magnification of indicia carried on an outer surface of the prescription bottle, when viewed through the aperture and the opening. An illumination source may be provided around a periphery of the magnifying lens to illuminate the indicia for better viewing.

Disclosed is a telescopic sight having two sighting points including an objective lens part which is provided in a telescopic sight body to reflect a light source beam irradiated from a light source part to a user's eye direction and transmitting an object beam and provided with a first focus part; a relay lens part which is provided in the telescopic sight body so as to be disposed between the objective lens part and the user's eye to erect and focus the light source beam and the object beam passing through the first focus part and provided with a second focus part; and an eyepiece lens part which is provided in the telescopic sight body as to be disposed between the relay lens part and the user's eye to eyepiece the light source beam and the object beam passing through the second focus part on the user's eye.

Disclosed is a telescopic sight having two sighting points including an objective lens part which is provided in a telescopic sight body to reflect a light source beam irradiated from a light source part to a user's eye direction and transmitting an object beam and provided with a first focus part; a relay lens part which is provided in the telescopic sight body so as to be disposed between the objective lens part and the user's eye to erect and focus the light source beam and the object beam passing through the first focus part and provided with a second focus part; and an eyepiece lens part which is provided in the telescopic sight body as to be disposed between the relay lens part and the user's eye to eyepiece the light source beam and the object beam passing through the second focus part on the user's eye.

An optical device with switchable multiple lenses can be mounted on an electronic device through a connecting module, and provides finely-adjusted alignment with an image capturing lens in any position, and provides a zoom or wide-angle lens for the user to change the focal length and view field of the image. A light-filling/polarizing regulation module to fill light and eliminate unnecessary reflected light to avoid marginal diminishing effect of the image. The optical device includes a viewing device, a connecting module and a light-filling/polarizing regulation module, wherein the viewing device includes a lens module located in the housing and having at least two lenses through which an image captured by the image capturing lens is magnified. At least two lenses has the same lens power, or at least two lenses of different magnifications can be used with the switchable lens seat to obtain the effects of switching different lenses.