How can blue light cause eye damage? Compared to UV light, human eyes are not nearly as good at blocking blue light. A very high percentage of visible blue lightpasses throughthe corneas and lenses of the eyes and reaches the retinas (the inner lining of the back of the eye). ...
An interesting characteristic of visible light is that exists as both a wave and a particle. This may sound strange, but consider first the wave aspect of visible light. Like any other wave, including waves in the ocean, light waves can travel in every direction, interact with other waves a...
Visible light is a type of electromagnetic radiation, which is transmitted in waves or particles at different wavelengths and frequencies. This broad range of wavelengths is known as the electromagnetic spectrum. That spectrum is typically divided into seven regions in order of decreasing wavelength and...
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LEDs were far more energy efficient than incandescent sources but initially were capable of emitting only very narrow wavelength bands, that is, single-color visible LEDs, until the invention of multi-chip LEDs and blue–violet-pumped- fluorescent LEDs to produce 'white' light. In this century,...
In this International Year of Light, it is particularly appropriate to review the historical concept of what is light and the controversies surrounding the extent of the visible spectrum. Today we recognize that light possesses both a wave and particle nature. It is also clear that the limits ...
Fig. 9: Percentage of light-coloured eyes in Europe. Blue eyes are most common around the Baltic Sea. (creative commons Robert Frost) (https://commons.wikimedia.org/wiki/File:Eye_colors_map_of_Europe.png#filelinks). Full size image An observation on frequency of eye colour from the Twins...
No Micropyle structure is visible in the anterior pole; however, it does seem to be a circular aperture where the micropyle could be located. Exochorion with both longitudinal and transversal single, flattened ridges that when joined, form cells (mainly rectangular or hexagonal) across the exo...
In the new moon phase, this percentage is 0% and becomes 100% at Full moon, about 14 days later. Thanks to the regular repetition of these moments, since ancient times, the lunar phases have been the basis of the lunisolar calendar. However, it was difficult to establish the exact ...
By 2009 there was a measurable correlation between the implementation of ISPM 15 and a 36–52% decline in the percentage of infested WPM intercepted at U.S. ports (Haack et al. 2014). However, a lack of baseline international interception data and the fact that different countries implemented...