Define who classification for assessment of vitamin a status, Biology

Assignment Help:

Define WHO classification for assessment of vitamin A status?

In addition, to the above mentioned manifestations, thickening of the hair follicles (follicular hyperkeratosis) is a cutaneous manifestation of vitamin A deficiency. From the description above it must be clear that xerophthalmia represents the ocular consequences of vitamin A deficiency that includes various manifestations, about which we have learnt above and the same are classified by WHO as given in Table.

Table: WHO classification for assessment of vitamin A status

182_WHO classification for assessment of vitamin A status.png

The classification presented above may be summarized as:

  • Stage XN is the earliest stage, involving night blindness owing to impaired dark adaptation,
  • Stage XI A is corneal xerosis caused by reduction of goblet cell mucus,
  • The appearance of Bitot's spot, a foamy excrescence on the temporal surface of the conjunctiva, constitutes the advancing stages (XIB),
  • X2 consists of simple drying of the cornea, a When the cornea undergoes the liguification process of keratomalacia, corneal ulceration, or both, it is classified as X3,
  • The situation is classified as X3A if <1/3 of the corneal surface is involved,
  • Past involvement leaves a corneal scar (XS), and
  • A globe destroyed by advanced keratomalacia is xerophthalmic funclus (XF).

 

The discussion above focused on the signs and symptoms of vitamin A deficiency. Let us now learn how common the problem of vitamin A deficiency is i.e. the prevalence of vitamin A in our country.


Related Discussions:- Define who classification for assessment of vitamin a status

Explain japanese encephalitis, Japanese encephalitis  Japanese encephal...

Japanese encephalitis  Japanese encephalitis is an uncommon but potentially fatal mosquito-borne viral disease that occurs in rural Asia, especially near pig farms and rice pad

Living organisms, List the five kingdoms into which most living organisms c...

List the five kingdoms into which most living organisms can be classified. Most living organisms can be classified as a) Bacteria, b) Protozoa, c) Fungi, d) Plants,

What is the autotrophic hypothesis on the origin of life, What is the autot...

What is the autotrophic hypothesis on the origin of life? An autotrophic hypothesis on the origin of life asserts that the first living beings on earth were producers of their

Dimensions of the cells, On a given microscope, the numerical aperture of t...

On a given microscope, the numerical aperture of the objective is 1.5. The microscope is provided with a filter that selects a wavelength of 500 nm. What is the limit of resolution

What are the cells that form the cartilaginous tissue, Q. What are the cell...

Q. What are the cells that form the cartilaginous tissue? The main cells of the cartilages are the chondrocytes originated from the chondroblasts that secrete the intersticial

Process of stabilize lipoprotein structure, Q. Process of stabilize lipopro...

Q. Process of stabilize lipoprotein structure? Ans. Apoproteins not only stabilize lipoprotein structure but also have other important regulatory functions in lipoprotein

Significance of gastrulation, SIGNIFICANC E OF GASTRULATION - It resul...

SIGNIFICANC E OF GASTRULATION - It results in the formation of three germ layers. It also resutls in the formation of different organs & organ systems. Gastrulation is e

Types oligosaccharide linkages, In glycoproteins, two main parts of oligosa...

In glycoproteins, two main parts of oligosaccharide linkages exist: a) An O-linked oligosaccharides attached to the protein by O-glycosidic bonds, to the OH groups of serine or

Why waste considered major environmental issues, Q. Why is waste considered...

Q. Why is waste considered one of the major environmental issues? The environmental problem regarding waste worsens with industrial development and the global growth of consump

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