Topic
Night vision
About: Night vision is a research topic. Over the lifetime, 6004 publications have been published within this topic receiving 67372 citations.
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TL;DR: Major enigmas of some of the functional properties of nocturnal photoreceptors are discussed, and recent advances in methodologies that may help to solve them and broaden the field of insect vision research to new model animals are described.
Abstract: Night vision is ultimately about extracting information from a noisy visual input. Several species of nocturnal insects exhibit complex visually guided behaviour in conditions where most animals are practically blind. The compound eyes of nocturnal insects produce strong responses to single photons and process them into meaningful neural signals, which are amplified by specialized neuroanatomical structures. While a lot is known about the light responses and the anatomical structures that promote pooling of responses to increase sensitivity, there is still a dearth of knowledge on the physiology of night vision. Retinal photoreceptors form the first bottleneck for the transfer of visual information. In this review, we cover the basics of what is known about physiological adaptations of insect photoreceptors for low-light vision. We will also discuss major enigmas of some of the functional properties of nocturnal photoreceptors, and describe recent advances in methodologies that may help to solve them and broaden the field of insect vision research to new model animals.This article is part of the themed issue 'Vision in dim light'.
28 citations
Patent•
21 Nov 2003
TL;DR: In this article, a combination of amber and cyan LEDs are selected to produce approximately three amber flux units for every cyan flux unit resulting in a white composite light, both of the selected LEDs have dominant wavelengths of less than 600 nm.
Abstract: An aircraft position light employs selected colored LEDs to produce a white appearing warning light with a reduced light component in the amplification spectrum of night vision imaging equipment. A combination of amber and cyan LEDs are selected to produce approximately three amber flux units for every cyan flux unit resulting in a white composite light. Both of the selected LEDs have dominant wavelengths of less than 600 nm.
28 citations
TL;DR: A Generation II night vision pocketscope has been shown to be effective in eliminating the symptom of night blindness in patients with retinitis pigmentosa and should be minimized to extend the period of usefulness of the instrument and to protect the patient against the possible harmful effects of excessive light exposure.
Abstract: A Generation II night vision pocketscope has been shown to be effective in eliminating the symptom of night blindness in patients with retinitis pigmentosa. This pocketscope provides sufficient light amplification to allow cone function under scotopic conditions. Minimum pocketscope gain and minimum output screen luminance required for mobility by these patients under scotopic conditions are correlated with their cone threshold elevations above normal. Instrument gain and output screen luminance should be minimized to extend the period of usefulness of the instrument and to protect the patient against the possible harmful effects of excessive light exposure. The advantages of a wide-angle lens and infrared light-emitting diode, attached to the pocketscope, are considered.
28 citations
TL;DR: The clinician should suspect retinitis pigmentosa, even in the absence of pigmentary changes, if there is a family history of the disorder, night blindness, peripheral field loss, and an impaired or nonrecordable electroretinographic response.
28 citations
Patent•
09 Oct 2001TL;DR: An intensified hybrid solid-state sensor as mentioned in this paper combines the best functions of the image intensifier, good signal-to-noise ratio and high logarithmic gain, with the electronic read-out functions either of a complementary metal oxide semiconductor (CMOS) or charged coupled device (CCD).
Abstract: An intensified hybrid solid-state sensor includes an imaging device comprising a solid-state sensor assembled with an image intensifier cathode, microchannel plate (MCP), and body envelope. This device combines the best functions of the image intensifier, good signal-to-noise ratio and high logarithmic gain, with the electronic read-out functions either of a Complementary Metal Oxide Semiconductor (CMOS) or charged coupled device (CCD). Applications for this invention are primarily night vision systems where good low light sensitivity and high gain are required.
28 citations