Wyniki wyszukiwania dla: TWO-PHOTON VISION, INFRARED VISION, THRESHOLD, LASER COMPARISON - MOST Wiedzy

Wyszukiwarka

Wyniki wyszukiwania dla: TWO-PHOTON VISION, INFRARED VISION, THRESHOLD, LASER COMPARISON
Przykład wyników znalezionych w innych katalogach

Wyniki wyszukiwania dla: TWO-PHOTON VISION, INFRARED VISION, THRESHOLD, LASER COMPARISON

  • Effects of laser pulse duration in two-photon vision threshold measurements

    Publikacja

    - Proceedings of SPIE - Rok 2021

    Pulsed near-infrared (NIR) light sources can be successfully applied for both imaging and functional testing of the human eye, as published recently1. These two groups of applications have different requirements. For imaging applications, the most preferable is invisible scanning beam while efficiently visible stimulating beam is preferable for functional testing applications. The functional testing of human eye using NIR laser...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Solid state versus fiber picosecond infrared lasers applied to two-photon vision tests

    Publikacja

    - Proceedings of SPIE - Rok 2019

    Development of new microperimetric tools dedicated for imaging of early functional changes in the retina may help in the monitoring of various ocular diseases progression e.g. Age-Related Macular Degeneration. Recently described two-photon vision may be applied to microperimetric devices. Many subjects with well-known disease history could be investigated with newly developed instrumentation that tests ability of human eye to perceive...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Towards spectral sensitivity curve for two-photon vision mechanism

    Publikacja
    • M. J. Marzejon
    • Z. Agnieszka
    • D. Stachowiak
    • G. Soboń
    • M. Wojtkowski
    • K. Katarzyna

    - Rok 2022

    Abstract Purpose: The perceived brightness of different visible light sources can be compared with photometric units based on the standardized luminosity curves (300-780nm range). As reported previously (PNAS 111(50), pp. E5445-E5454 (2014)), near-infrared (NIR) radiation can cause isomerization of visual pigments by one- or two-photon absorption. The perceived color of the stimulus is red in the case of one-photon vision (1PV)...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Femtosecond Er-doped fiber laser source tunable from 872 to 1075 nm for two-photon vision studies in humans

    Publikacja
    • D. Stachowiak
    • M. J. Marzejon
    • J. Bogusławski
    • Z. Łaszczych
    • K. Komar
    • M. Wojtkowski
    • G. Soboń

    - Biomedical Optics Express - Rok 2022

    We report the development of a widely-tunable femtosecond fiber laser system and its application for two-photon vision studies. The source is based on an Er-doped fiber laser with spectral shift up to 2150 nm, followed by a second harmonic generation module to generate a frequency-doubled beam tunable from 872 to 1075 nm. The source delivers sub-230 fs pulses with nearly-constant duration over the entire tuning range, with output...

    Pełny tekst do pobrania w portalu

  • Two-photon microperimetry with picosecond pulses

    Publikacja

    - Biomedical Optics Express - Rok 2021

    Two-photon vision is a phenomenon associated with the perception of short pulsesof near-infrared radiation (900-1200 nm) as a visible light. It is caused by the nonlinear processof two-photon absorption by visual pigments. Here we present results showing the influence ofpulse duration and repetition rate of short pulsed lasers on the visual threshold. We comparedtwo-photon sensitivity maps of the retina obtained for subjects with...

    Pełny tekst do pobrania w portalu

  • Pupil detection supported by Haar feature based cascade classifier for two-photon vision examinations

    Publikacja

    - Rok 2019

    The aim of this paper is to present a novel method, called Adaptive Edge Detection (AED), of extraction of precise pupil edge coordinates from eye image characterized by reflections of external illuminators and laser beams. The method is used for monitoring of pupil size and position during psychophysical tests of two-photon vision performed by dedicated optical set-up. Two-photon vision is a new phenomenon of perception of short-pulsed...

    Pełny tekst do pobrania w portalu

  • Two-photon perimetry utilizing picosecond laser

    Publikacja

    - Rok 2022

    Age-related impairments are becoming more and more severe for aging societies. The sensory organ diseases are particularly troublesome as they exclude seniors from their everyday activity. Therefore, maintaining good quality eyesight is essential for normal functioning. New medical therapies help restrain age-related changes, but still, monitoring is essential to the treatment process. Humans do not have the natural ability to...

    Pełny tekst do pobrania w portalu

  • From Knowledge based Vision Systems to Cognitive Vision Systems: A Review

    Publikacja

    - Rok 2018

    Computer vision research and applications have their origins in 1960s. Limitations in computational resources inherent of that time, among other reasons, caused research to move away from artificial intelligence and generic recognition goals to accomplish simple tasks for constrained scenarios. In the past decades, the development in machine learning techniques has contributed to noteworthy progress in vision systems. However,...

    Pełny tekst do pobrania w portalu

  • Pupil detection supported by Haar feature based cascade classifier for two-photon vision examinations

    Publikacja

    - Rok 2019

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Vision Zero in Poland

    Poland’s experience of road safety work is relatively short. In the early 1990s road deaths soared to a staggering 8000 a year. A diagnosis found that Poland’s lack of systemic road safety action was to blame for those figures. In response, the state set up road safety bodies and commissioned road safety programs. In 2005, Poland followed the example of Sweden and adopted Vision Zero as a far-reaching concept of changes in road...

    Pełny tekst do pobrania w portalu