23 relations: Adaptation (eye), Biological pigment, Candela, Candela per square metre, Color vision, Cone cell, Contrast (vision), Focal Press, Human eye, International System of Units, Intrinsically photosensitive retinal ganglion cells, Lumen (unit), Luminance, Luminous efficacy, Mesopic vision, Photometry (optics), Purkinje effect, Retina, Scotopic vision, Spatial frequency, Visible spectrum, Visual acuity, Visual perception.
In ocular physiology, adaptation is the ability of the eye to adjust to various levels of light.
Biological pigments, also known simply as pigments or biochromes, are substances produced by living organisms that have a color resulting from selective color absorption.
The candela (or; symbol: cd) is the base unit of luminous intensity in the International System of Units (SI); that is, luminous power per unit solid angle emitted by a point light source in a particular direction.
The candela per square metre (cd/m2) is the derived SI unit of luminance.
Christmas is an annual festival commemorating the birth of Jesus Christ,Martindale, Cyril Charles.
The Christmas season, also called the festive season, or the holiday season (mainly in the U.S. and Canada; often simply called the holidays),, is an annually recurring period recognized in many Western and Western-influenced countries that is generally considered to run from late November to early January.
Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus.
Christmas traditions vary from country to country.
Color vision is the ability of an organism or machine to distinguish objects based on the wavelengths (or frequencies) of the light they reflect, emit, or transmit.
Cone cells, or cones, are one of three types of photoreceptor cells in the retina of mammalian eyes (e.g. the human eye).
Contrast is the difference in luminance or colour that makes an object (or its representation in an image or display) distinguishable.
Focal Press is a publisher of media technology books and it is an imprint of Taylor & Francis.
The human eye is an organ which reacts to light and pressure.
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.
Intrinsically photosensitive retinal ganglion cells (ipRGCs), also called photosensitive retinal ganglion cells (pRGC), or melanopsin-containing retinal ganglion cells (mRGCs), are a type of neuron in the retina of the mammalian eye.
The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source.
Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction.
Luminous efficacy is a measure of how well a light source produces visible light.
Mesopic vision is a combination of photopic vision and scotopic vision in low but not quite dark lighting situations.
New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.
New Year's Day, also called simply New Year's or New Year, is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar.
In the Gregorian calendar, New Year's Eve (also known as Old Year's Day or Saint Sylvester's Day in many countries), the last day of the year, is on 31 December which is the seventh day of Christmastide.
Photometry is the science of the measurement of light, in terms of its perceived brightness to the human eye.
The Purkinje effect (sometimes called the Purkinje shift) is the tendency for the peak luminance sensitivity of the human eye to shift toward the blue end of the color spectrum at low illumination levels as part of dark adaptation.
The retina is the innermost, light-sensitive "coat", or layer, of shell tissue of the eye of most vertebrates and some molluscs.
Scotopic vision is the vision of the eye under low-light levels.
In mathematics, physics, and engineering, spatial frequency is a characteristic of any structure that is periodic across position in space.
The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
Visual acuity (VA) commonly refers to the clarity of vision.
Visual perception is the ability to interpret the surrounding environment using light in the visible spectrum reflected by the objects in the environment.
2018 has been designated as the third International Year of the Reef by the International Coral Reef Initiative.
2019 (MMXIX) will be a common year starting on Tuesday of the Gregorian calendar, the 2019th year of the Common Era (CE) and Anno Domini (AD) designations, the 19th year of the 3rd millennium, the 19th year of the 21st century, and the 10th and last year of the 2010s decade.