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The functions of tears include lubricating the eyes (basal tears), removing irritants (reflex tears), and also aiding the immune system. [3] Tears also occur as a part of the body's natural pain response. [4] Emotional secretion of tears may serve a biological function by excreting stress-inducing hormones built up through times of emotional ...
Crying is the dropping of tears (or welling of tears in the eyes) in response to an emotional state or physical pain. Emotions that can lead to crying include sadness , anger , joy , and fear . Crying can also be caused by relief from a period of stress or anxiety , or as an empathetic response.
Eye examination with the aid of a slit lamp. Side view of a slit lamp machine. Cataract in human eye: magnified view seen on examination with the slit lamp. In ophthalmology and optometry, a slit lamp is an instrument consisting of a high-intensity light source that can be focused to shine a thin sheet of light into the eye.
The office has traditionally been a place to keep a stiff upper lip, but recently, with an emotional new speaker of the House and TV commentators who choke up freely, tears have been making a ...
Dehydration, mental activities, work conditions, room temperature, relative humidity, and illumination all influence blink frequency. Break-up time (BUT) is another major measure of eye irritation and tear film stability. [73] It is defined as the time interval (in seconds) between blinking and rupture.
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a filament that is heated until it glows. The filament is enclosed in a glass bulb that is either evacuated or filled with inert gas to protect the filament from oxidation .
There are so many enduring symbols of Christmas: the trimmed tree, stockings hung by the chimney with care, and of course, jolly Ol' Saint Nick.But for Ree Drummond, there's one Christmas ...
An electric light, lamp, or light bulb is an electrical component that produces light. It is the most common form of artificial lighting . Lamps usually have a base made of ceramic , metal, glass, or plastic which secures the lamp in the socket of a light fixture , which is often called a "lamp" as well.