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Dispersion = Abbe Number or Constringency Value and Nu Value

- Point -  Dispersion is categorized by Abbe Number or as it is also known by Constringency Value or Nu Value. - Point Word- Dispersion Abbe Number Constringency Value Nu Value - Explanation -  Dispersion refers to the state in which light is scattered or spread out. It refers to the separation of the constituent colors of light, like a rainbow.  Abbe Number is an optical property that describes how much a transparent material scatters light. It is a measure of chromatic dispersion. A higher Abbe Number indicates less dispersion and less chromatic aberration.
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5 Types of Astigmatism


- Point -

 There are five types of astigmatism.


- Simple Myopic Astigmatism

- Simple Hyperopic Astigmatism

- Compound Myopic Astigmatism

- Compound Hyperopic Astigmatism

- Mixed Astigmatism



- Point Word-

  • Simple

  • Compound

  • Mixed

  • Myopic

  • Hyperopic



- Explanation -

Simple Myopic Astigmatism is an astigmatism in which one of the two meridians is in front of the retina and the other is on the retina.
 Simple Myopic Astigmatism is an astigmatism in which one of the two meridians is in front of the retina and the other is on the retina.




Simple Hyperopic Astigmatism is an astigmatism in which one of the two meridians is behind the retina and the other is on the retina.

 Simple Hyperopic Astigmatism is an astigmatism in which one of the two meridians is behind the retina and the other is on the retina.




Compound Myopic Astigmatism is astigmatism where both meridians are in front of the retina.

 Compound Myopic Astigmatism is astigmatism where both meridians are in front of the retina.




Compound Hyperopic Astigmatism is astigmatism where both meridians are behind the retina.

 Compound Hyperopic Astigmatism is astigmatism where both meridians are behind the retina.




Mixed Astigmatism is astigmatism where one of the two meridians is in front of the retina and the other is behind the retina.
 Mixed Astigmatism is astigmatism where one of the two meridians is in front of the retina and the other is behind the retina.





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