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Tears are a clear liquid secreted by the lacrimal glands (tear gland) found in the eyes of all land mammals. Their functions include lubricating the eyes (basal tears), removing irritants (reflex tears), and aiding the immune system. Tears also occur as a part of the body’s natural pain response. Humans are the only mammals known to produce tears as part of an emotional response, such as out of joy or grief. Tears have symbolic significance among humans (see crying). Emotional secretion of tears may serve a biological function by excreting stress-inducing hormones built up through times of emotional distress. Tears are made up of water, electrolytes, proteins, lipids, and mucins that form layers on the surface of eyes. The different types of tears—basal, reflex, and emotional—vary significantly in composition.

The lacrimal glands secrete lacrimal fluid, which flows through the main excretory ducts into the space between the eyeball and the lids. When the eyes blink, the lacrimal fluid is spread across the surface of the eye. Lacrimal fluid gathers in the lacrimal lake which is found in the medial part of the eye. The lacrimal papilla is an elevation in the inner side of the eyelid, at the edge of the lacrimal lake. The lacrimal canaliculi open into the papilla. The opening of each canaliculus is the lacrimal punctum. From the punctum, tears will enter the lacrimal sac, then on to the nasolacrimal duct, and finally into the nasal cavity. An excess of tears, as caused by strong emotion, can cause the nose to run. Quality of vision is affected by the stability of the tear film.

Advantages of Tears PNG Format

    • Higher bit depths (more colors) PNG allows for 1, 2, 4, 8, 16, 24 and 32 bit images, smashing the 8-bit barrier
    • A permanent, royalty-free license PNG is being developed by the W3C, and will always be a free and open standard
    • Multiple layers of transparency Tears PNG images allow for full alpha channel transparency, which makes moving images from one background to another easy.
    • Uses a lossless image compression technique, hence no information is lost and the image is retrieved keeping the same quality.
    • Supports all the true colors, unlike the contemporary GIF format which only supports 256 colors.
    • Alpha channel support in PNG images allows transparency of the file format which is not possible with other file formats.


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