Did Thomas Watson start IBM from scratch?
Last week’s fact: How many layers of fluid make up normal tears and how do the tears stay on the vertical surface of the eyeball? Three layers.
· lipid or oil layer,
· lacrimal or aqueous layer, and
· mucoid or mucin layer
The epithelial surface of the cornea is naturally “hydrophobic” (water-repelling). Therefore, for a tear layer to be able to remain on the corneal surface without rolling off, the “hydrophilic” (water-attracting) mucoid or mucin layer of the tear film is laid down onto the surface of the cornea by “goblet cells,” which are present in the bulbar conjunctiva. In turn, the lacrimal layer of the tear film, located above the mucoid layer, can defy gravity and remain on the front of the eye. See Cornea
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