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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08 May 1996TL;DR: In this paper, the aspect ratio of the display is selected so as to provide only the same information quantity as that by viewed by the eyes of an observer through the windshield, when the horizontal direction size becomes narrow (so as to cut a close distant part being unrequired as information, for example).
Abstract: PROBLEM TO BE SOLVED: To improve the depth sensitivity of a display in a noctvision system where a sensor adding a wide angle optical system and a visible display. SOLUTION: The sensor 11 is constituted so as to have selected-sized sight in a horizontal direction and the aspect ratio of the display is selected based on the horizontal direction size. The sensor 11 is attached to an upper part (on the roof of an automobile, for example) of windshield. The aspect ratio of the display is selected so as to provide only the same information quantity as that by viewed by the eyes of an observer through the windshield and so as to reduce the display aspect ratio when the horizontal direction size becomes narrow (so as to cut a close distant part being unrequired as information, for example). COPYRIGHT: (C)1997,JPO
25 citations
TL;DR: This cross-sectional analysis demonstrates associations of patient-reported functional deficits, as assessed on the Low Luminance Questionnaire, with both reduced DA and reduced choroidal thickness, in a population of older adults with varying degrees of AMD severity and good visual acuity in at least 1 eye.
25 citations
TL;DR: Research on the measurement of the 50% probability of identification cycle criteria (N50,V50) for a set of hand-held objects normally held or used in a single hand to calibrate the Night Vision Electronic Sensors Directorate (NVESD) target acquisition models.
Abstract: This paper describes research on the measurement of the 50% probability of identification cycle criteria (N50,V50) for a set of hand-held objects normally held or used in a single hand. These cycle criteria are used to calibrate the Night Vision Electronic Sensors Directorate (NVESD) target acquisition models. The target set consists of 12 objects, from innocuous to potentially lethal. Objects are imaged in the visible, midwave infrared (MWIR), and long-wave infrared (LWIR) spectrum at 12 different aspects. Two human perception experiments are performed. The first experiment simulates an incremental constriction of the imaging systems modulation transfer function (MTF). The N50, and V50 calibration criteria are measured from this perception experiment. The second experiment not only simulates an incremental constriction of the system MTF but also down samples the imagery to simulate the objects at various ranges. The N50 and V50 values are used in NVTherm 2002 and NVThermIP, respectively, to generate range prediction curves for both the LWIR and MWIR sensors. The range predictions from both NVTherm versions are then compared with the observer results from the second perception experiment. The comparison between the results of the second experiment and the model predictions provides a verification of measured cycle criteria.
25 citations
25 Jul 2002
Abstract: Voor een hypothetische warmtebeeldcamera werden 3 doelacquisitiemodellen gedraaid, waarbij de sensorparameters systematisch werden gevarieerd. De verschillen in uitkomst zijn zorgwekkend.
25 citations
TL;DR: The results of photorefractive keratectomy for myopia using the Nidek laser are acceptable as long as the patients are informed of the limitations of PRK, and the subjective aspects of vision are analyzed.
Abstract: Purpose To analyze the results of photorefractive keratectomy (PRK) for myopia of 6.0 to 10.0 diopters (D) using the Nidek laser and compare them with those in other series, including LASIK, and to analyze the subjective aspects of vision. Setting Remuera Eye Clinic, Auckland, New Zealand. Method One hundred ninety-two eyes of 162 consecutive PRK patients with a 6 month follow-up were studied. All had myopia in the range of 6.0 to 10.0 D by spherical equivalent. Astigmatism of up to 3.5 D was treated by laser simultaneously. At 6 months, uncorrected visual acuity, best spectacle-corrected visual acuity, residual refractive error, and corneal haze were recorded. After the 6 month examination, a questionnaire was sent to all patients. Results Uncorrected visual acuity of 20/20 was achieved in 59% of eyes and of 20/40 or better in 94%. The accuracy of correction was ±0.5 D of emmetropia in 77% and ±1.0 D in 94%. In 2 eyes (1.0%), corneal haze was assessed as 2+ and 2 Snellen lines of best corrected visual acuity were lost. The questionnaire revealed that 45% of patients had difficulties with night vision. This was better than before surgery in 35% but worse in 31%. Halos were seen around lights by 52%, but these were less than before surgery in 21% and worse in 26%. There was undue sensitivity to glare in 29%, but this was better than before surgery in 19% and worse in 28%. The overall quality of vision was better than before surgery in 60% and worse in 17%. Seventy-seven percent did not need spectacles. Ninety-eight percent said they would have the surgery again. Conclusions As long as the patients are informed of the limitations of PRK for myopia, the results are acceptable.
25 citations