What are the physical properties of tear film, Biology

Assignment Help:

What are the physical properties of Tear Film?

Physical Properties of Tear Film: The tear film is a three-layered structure as given below:

1) Outermost Layer: Lipid Layer

This layer is secreted by the meibomian glands and is 0.1 mm thick. The main function it performs is to spread over the liquid layer and retard the evaporation of the aqueous layer and maintain the stability of the tear film.

2) Middle Layer: Aqueous Layer

Forms a bulk of the tear film and is secreted by the main and accessory lacrimal glands. It contains essential nutrients and substances necessary for the health and integrity of the cornea. It is approximately 7 mm in thickness.

3) Inner Layer: Mucin Layer

Mucin layer is secreted by the goblet cells of the conjunctiva. This layer is approximately 1 mm thick and functions to convert the hydrophobic corneal epithelium to hydrophilic, allowing the aqueous layer to spread over it.


Related Discussions:- What are the physical properties of tear film

Terrestrial and aquatic ecosystem, Terrestrial and Aquatic Ecosystem W...

Terrestrial and Aquatic Ecosystem What is common between a terrestrial and an aquatic ecosystem. Both have similar type of trophic structure. They possess an autotrophic layer

Should human gene therapy be continued, Debate over ethics of using gene th...

Debate over ethics of using gene therapy for treating human beings started since the discovery of recombinant DNA technology. The mere fact that it involves the alteration of DNA w

What do the major organs of the digestive system do, What do the major orga...

What do the major organs of the digestive system do? They are salivary glands, teeth, tongue, gums, esophagus, stomach, small intestine, large intestine, pancreas, liver, and g

Explain the factors affecting gi of foods, Explain the Factors Affecting GI...

Explain the Factors Affecting GI of Foods? A variety of factors affect GI of foods. The factors which affect the rate of glucose absorption from starchy foods and therefore the

Define type of instruments used in spectral techniques, Define Type of Inst...

Define Type of Instruments used in Spectral Techniques? A wide range of instruments are available, possessing a combination of features but there is no rigid classification of

Explain ketoconazole, Explain Ketoconazole It is now seldom used. The ...

Explain Ketoconazole It is now seldom used. The other azoles have fewer adverse effects and are usually preferred. Ketoconazole remains an option for treatment of infections w

Circulatory system, Circulatory System Coelenterates and platyhelminth...

Circulatory System Coelenterates and platyhelminths nutrients in sponges, respiratory gases and waste materials can easily diffuse through the intercellular spaces. Though, in

Foraminifera, Foraminifera is the single-celled protists which secrete a s...

Foraminifera is the single-celled protists which secrete a shell or test. This is the accumulations of the shells of dead foraminifera and the other microscopic sea creatures form

Illustrate about the intra-ocular pressure, Illustrate about the Intra-ocul...

Illustrate about the Intra-ocular pressure It is the pressure maintained inside the eye above the atmospheric pressure. It is higher than fluid pressure in any other tissue (2-

Phototherapy unit, Phototherapy Unit Principle Photoisomerisat...

Phototherapy Unit Principle Photoisomerisation and photo-oxidation changes indirect bilirubin into water soluble substance. Operational Instruction Adjust

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd