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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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Trifocals prescribtion


- Point -

 Trifocals are prescribed for advenced presbyopes.



- Point Word-

  • Presbyopes

  • Trifocals prescribtion

  • For advenced



- Explanation -

When a person looks at distance, intermedia, and near, the height of his gaze changes. Using this, applying a triple focus lens to glasses can improve the visual life of a person with presbyopia.
 When a person looks at distance, intermedia, and near, the height of his gaze changes. Using this, applying a triple focus lens to glasses can improve the visual life of a person with presbyopia.




The figure above shows two types of trifocal focus lenses. In addition to this, there are many other types of functional lenses, such as progressive focus lenses.

 The figure above shows two types of trifocal focus lenses. In addition to this, there are many other types of functional lenses, such as progressive focus lenses.






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