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a drop of the secretion of the lacrimal glands
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a drop of the clear, slightly opalescent fluid secreted by the lacrimal glands. Tears are slightly alkaline. They contain as much as 99 percent water and 0.9 percent inorganic matter, chiefly sodium chloride and small quantities of sodium carbonate, magnesium carbonate, calcium sulfate, and calcium phosphate, as well as the antibacterial enzyme lysozyme; other proteins constitute 0.1 percent. Tears moisten the anterior surface of the eye and prevent it from drying, wash foreign bodies out of the conjunctival sac, and participate in the nutrition of the cornea.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


run, 3
1. In roofing, the horizontal distance from the face of a wall to the ridge of the roof.
2. In stairways, the width of a single stair tread.
3. The horizontal distance covered by a flight of steps.
4. The runway or track for a sash.
5. A small stream of paint flowing vertically on a
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Selected patients were randomized (by block permutation method) in the ratio of 1:1 into two groups to receive either the artificial tears or cyclosporine as add-on the drug with the artificial tear.
Osmoprotectants commonly used in artificial tears are erythritol, glycerol, L-carnitin, and betaine (BAUDOUIN et al., 0013).
46 dry eye cases were treated with artificial tears.10 cases who showed evidence of meibomian gland disease were treated with doxycycline.
The mainstays of dry eye treatment are over-the-counter artificial tears in the form of eyedrops.
Artificial tears are the primary treatment for dry eyes.
The clinical trial by Florida ophthalmologists randomized 37 patients with ocular rosacea to twice-daily topical cyclosporine 0.05% (Restasis) or artificial tears for 3 months.
It is closely related to rheumatoid arthritis and is treated in much the same way with the addition of artificial tears and skin moisturisers.
A Dry eye syndrome can be treated with artificial tears or eye lubricant ointments.
"Other products are basically artificial tears. They're not therapeutic drops--they're comfort drops." $12.78 suggested retail.
Dry eyes respond to the use of artificial tears applied every one to four hours or to pharmacological stimulation of tear production.
An often-recommended brand of artificial tears is Refresh.
Artificial tears, sold over the counter (OTC), are the most widely used treatment for dry eye.