Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Little is known about the effects of brief, repetitive laser pulses in the microsecond and sub-microsecond range on visual adaptation. Although it is generally acknowledged that, for pulsed light exposures from 1 to 150 ms, the total energy of a flash (intensity x duration) determines its brightness or adaptation potential, there are little data supporting this reciprocal relationship in human subjects. The purpose of this study was to compare the increment threshold for a spot target superimposed on an extended source image of a pulsed laser source, and to evaluate whether reciprocity holds. Eight subjects completed a method-of-adjustment determination of increment threshold for a 023 white test spot viewed superimposed on an extended source image (0.61) of a green (532 nm) laser beam. The laser pulse durations were 10 micro s, 100 micro s, 1 ms and 10 ms at 3 Hz and 10Hz. In addition, the effect of continuous wave (CW) exposure was determined. The time-average laser exposure was held constant across all the laser conditions. For the 3 Hz pulse condition, the threshold luminance was much lower than for the CW condition and there was no effect of pulse width, i.e. reciprocity was observed. However, thresholds for the 1 ms and 10 ms pulses at 10 Hz were higher than for the DW case, and this reciprocity failure was interrupted as a brightness enhancement effect More pulse durations and pulse rates must be studied before this failure can be more fully understood.
A Study of the Effects of Multiple-Pulsed Laser Exposure on Increment Thresholds
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Little is known about the effects of brief, repetitive laser pulses in the microsecond and sub-microsecond range on visual adaptation. Although it is generally acknowledged that, for pulsed light exposures from 1 to 150 ms, the total energy of a flash (intensity x duration) determines its brightness or adaptation potential, there are little data supporting this reciprocal relationship in human subjects. The purpose of this study was to compare the increment threshold for a spot target superimposed on an extended source image of a pulsed laser source, and to evaluate whether reciprocity holds. Eight subjects completed a method-of-adjustment determination of increment threshold for a 023 white test spot viewed superimposed on an extended source image (0.61) of a green (532 nm) laser beam. The laser pulse durations were 10 micro s, 100 micro s, 1 ms and 10 ms at 3 Hz and 10Hz. In addition, the effect of continuous wave (CW) exposure was determined. The time-average laser exposure was held constant across all the laser conditions. For the 3 Hz pulse condition, the threshold luminance was much lower than for the CW condition and there was no effect of pulse width, i.e. reciprocity was observed. However, thresholds for the 1 ms and 10 ms pulses at 10 Hz were higher than for the DW case, and this reciprocity failure was interrupted as a brightness enhancement effect More pulse durations and pulse rates must be studied before this failure can be more fully understood.
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Little is known about the effects of brief, repetitive laser pulses in the microsecond and sub-microsecond range on visual adaptation. Although it is generally acknowledged that, for pulsed light exposures from 1 to 150 ms, the total energy of a flash (intensity x duration) determines its brightness or adaptation potential, there are little data supporting this reciprocal relationship in human subjects. The purpose of this study was to compare the increment threshold for a spot target superimposed on an extended source image of a pulsed laser source, and to evaluate whether reciprocity holds. Eight subjects completed a method-of-adjustment determination of increment threshold for a 023 white test spot viewed superimposed on an extended source image (0.61) of a green (532 nm) laser beam. The laser pulse durations were 10 micro s, 100 micro s, 1 ms and 10 ms at 3 Hz and 10Hz. In addition, the effect of continuous wave (CW) exposure was determined. The time-average laser exposure was held constant across all the laser conditions. For the 3 Hz pulse condition, the threshold luminance was much lower than for the CW condition and there was no effect of pulse width, i.e. reciprocity was observed. However, thresholds for the 1 ms and 10 ms pulses at 10 Hz were higher than for the DW case, and this reciprocity failure was interrupted as a brightness enhancement effect More pulse durations and pulse rates must be studied before this failure can be more fully understood.
A Study of the Effects of Multiple Pulse Laser Exposure on Increment Thresholds
Author: Peter Smith
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
Book Description
Energy Research Abstracts
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 660
Book Description
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 660
Book Description
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 542
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 542
Book Description
Selected Papers on Ultrashort Laser Pulse Bioeffects
Author: William P. Roach
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Eye
Languages : en
Pages : 694
Book Description
This volume contains key papers that document the initial probing of the limits of subnanosecond pulses and the resulting discoveries of nonlinear effects. The papers tell the story of effects previously thought to be impossible to produce in tissue. If you read all the references carefully, you will see the studies evolve from speculation to experimentation to theory, and culminate in policy recommendations.
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Eye
Languages : en
Pages : 694
Book Description
This volume contains key papers that document the initial probing of the limits of subnanosecond pulses and the resulting discoveries of nonlinear effects. The papers tell the story of effects previously thought to be impossible to produce in tissue. If you read all the references carefully, you will see the studies evolve from speculation to experimentation to theory, and culminate in policy recommendations.
Determination of Energy Thresholds on an Artificial Retina Using a Multiple-pulsed Laser
Author: Albert David Stephenson
Publisher:
ISBN:
Category :
Languages : en
Pages : 100
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 100
Book Description
Laser Induced Damage in Optical Materials
Author:
Publisher:
ISBN:
Category : Laser materials
Languages : en
Pages : 424
Book Description
Publisher:
ISBN:
Category : Laser materials
Languages : en
Pages : 424
Book Description
NBS Special Publication
Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 460
Book Description
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 460
Book Description
Laser Induced Damage in Optical Materials, 1978
Author: Alexander J. Glass
Publisher:
ISBN:
Category : Laser materials
Languages : en
Pages : 372
Book Description
Publisher:
ISBN:
Category : Laser materials
Languages : en
Pages : 372
Book Description
Laser Induced Damage in Optical Materials:1978
Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 365
Book Description
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 365
Book Description