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Author |
Nickla, D.L.; Totonelly, K. |
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Title |
Brief light exposure at night disrupts the circadian rhythms in eye growth and choroidal thickness in chicks |
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Journal Article |
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Year |
2016 |
Publication |
Experimental eye Research |
Abbreviated Journal |
Exp Eye Res |
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Volume |
146 |
Issue  |
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Pages |
189-195 |
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Keywords |
Animals |
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Abstract |
Changes in ocular growth that lead to myopia or hyperopia are associated with alterations in the circadian rhythms in eye growth, choroidal thickness and intraocular pressure in animal models of emmetropization. Recent studies have shown that light at night has deleterious effects on human health, acting via “circadian disruptions” of various diurnal rhythms, including changes in phase or amplitude. The purpose of this study was to determine the effects of brief, 2-hour episodes of light in the middle of the night on the rhythms in axial length and choroidal thickness, and whether these alter eye growth and refractive error in the chick model of myopia. Starting at 2 weeks of age, birds received 2 hours of light between 12:00 am and 2:00 am for 7 days (n=12; total hours of light: 14 hrs). Age-matched controls had a continuous dark night (n=14; 14L/10D). Ocular dimensions were measured using high-frequency A-scan ultrasonography on the first day of the experiment, and again on day 7, at 6-hour intervals, starting at noon (12pm, 6pm, 12am, 6am, 12pm). Measurements during the night were done under a photographic safe-light. These data were used to determine rhythm parameters of phase and amplitude. 2 groups of birds, both experimental (light at night) and control, were measured with ultrasound at various intervals over the course of 4 weeks to determine growth rates. Refractive errors were measured in 6 experimental and 6 control birds at the end of 2 weeks. Eyes of birds in a normal L/D cycle showed sinusoidal 24-hour period diurnal rhythms in axial length and choroid thickness. Light in the middle of the night caused changes in both the rhythms in axial length and choroidal thickness, such that neither could be fit to a sine function having a period of 24 hours. Light caused an acute, transient stimulation in ocular growth rate in the subsequent 6-hour period (12 am to 6 am), that may be responsible for the increased growth rate seen 4 weeks later, and the more myopic refractive error. It also abolished the increase in choroidal thickness that normally occurs between 6 pm and 12 am. We conclude that light at night alters the rhythms in axial length and choroidal thickness in an animal model of eye growth, and that these circadian disruptions might lead to the development of ametropias. These results have implications for the use of light during the night in children. |
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The New England College of Optometry, Boston, MA, USA |
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0014-4835 |
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PMID:26970497 |
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Call Number |
LoNNe @ kyba @ |
Serial |
1371 |
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Author |
Li, C.; Hsu, N.C.; Sayer, A.M.; Krotkov, N.A.; Fu, J.S.; Lamsal, L.N.; Lee, J.; Tsay, S.-C. |
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Title |
Satellite observation of pollutant emissions from gas flaring activities near the Arctic |
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Journal Article |
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Year |
2016 |
Publication |
Atmospheric Environment |
Abbreviated Journal |
Atmospheric Environment |
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Volume |
133 |
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Pages |
1-11 |
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Keywords |
Remote Sensing |
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1352-2310 |
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no |
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LoNNe @ kyba @ |
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1373 |
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Author |
Kolláth, Z.; Dömény, A.; Kolláth, K.; Nagy, B. |
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Title |
Qualifying lighting remodelling in a Hungarian city based on light pollution effects |
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Journal Article |
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Year |
2016 |
Publication |
Journal of Quantitative Spectroscopy and Radiative Transfer |
Abbreviated Journal |
Journal of Quantitative Spectroscopy and Radiative Transfer |
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181 |
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46-51 |
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Keywords |
Skyglow; Lighting |
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Abstract |
The public lighting system has been remodelled in several Hungarian cities. In some cases the majority of the old luminaries were fitted with high pressure sodium lamps and they were replaced with white LED lighting with a typical correlated colour temperature of about 4500 K. Therefore, these remodelling works provide a testbed for methods in measurements and modelling. We measured the luminance of the light domes of selected cities by DSLR photometry before and after the remodelling.
Thanks to the full cut off design of the new lighting fixtures we obtained a slight decrease even in the blue part of the sky dome spectra of a tested city. However, we have to note that this positive change is the result of the bad geometry (large ULR) of the previous lighting system. Based on Monte Carlo radiative transfer calculations we provide a comparison of different indicators that can be used to qualify the remodelling, and to predict the possible changes in light pollution. |
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0022-4073 |
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no |
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LoNNe @ kyba @; GFZ @ kyba @ |
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1375 |
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Author |
Duriscoe, D.M. |
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Title |
Photometric indicators of visual night sky quality derived from all-sky brightness maps |
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Journal Article |
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Year |
2016 |
Publication |
Journal of Quantitative Spectroscopy and Radiative Transfer |
Abbreviated Journal |
JQSRT |
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Volume |
181 |
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33-45 |
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Keywords |
Skyglow; Instrumentation |
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Abstract |
Wide angle or fisheye cameras provide a high resolution record of artificial sky glow, which results from the scattering of escaped anthropogenic light by the atmosphere, over the sky vault in the moonless nocturnal environment. Analysis of this record yields important indicators of the extent and severity of light pollution. The following indicators were derived through numerical analysis of all-sky brightness maps: zenithal, average all-sky, median, brightest, and darkest sky brightness. In addition, horizontal and vertical illuminance, resulting from sky brightness were computed. A natural reference condition to which the anthropogenic component may be compared is proposed for each indicator, based upon an iterative analysis of a high resolution natural sky model. All-sky brightness data, calibrated in the V band by photometry of standard stars and converted to luminance, from 406 separate data sets were included in an exploratory analysis. Of these, six locations representing a wide range of severity of impact from artificial sky brightness were selected as examples and examined in detail. All-sky average brightness is the most unbiased indicator of impact to the environment, and is more sensitive and accurate in areas of slight to moderate light pollution impact than zenith brightness. Maximum vertical illuminance provides an excellent indicator of impacts to wilderness character, as does measures of the brightest portions of the sky. Zenith brightness, the workhorse of field campaigns, is compared to the other indicators and found to correlate well with horizontal illuminance, especially at relatively bright sites. The median sky brightness describes a brightness threshold for the upper half of the sky, of importance to telescopic optical astronomy. Numeric indicators, in concert with all-sky brightness maps, provide a complete assessment of visual sky quality at a site. |
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U.S. National Park Service, Natural Sounds and Night Skies Division, 351 Pacu Lane, Bishop, CA 93514, USA; dan_duriscoe(at)nps.gov |
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Elsevier |
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English |
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English |
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0022-4073 |
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no |
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Call Number |
LoNNe @ kyba @ ; IDA @ john @ |
Serial |
1376 |
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Author |
Matsuda, R.; Yamano, T.; Murakami, K.; Fujiwara, K. |
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Title |
Effects of spectral distribution and photosynthetic photon flux density for overnight LED light irradiation on tomato seedling growth and leaf injury |
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Journal Article |
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Year |
2016 |
Publication |
Scientia Horticulturae |
Abbreviated Journal |
Scientia Horticulturae |
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Volume |
198 |
Issue |
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Pages |
363-369 |
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Keywords |
Plants |
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0304-4238 |
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Call Number |
LoNNe @ kyba @ |
Serial |
1387 |
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