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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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Phoria


- Point -

 Phoria - A tendency for the eye to deviate.



- Point Word-

  • Tendency


- Explanation -

Phoria is normally in orthophoria. Covering causes the eyes to return to a specific location. When uncovered, the eyes return to orthophoria.

 Phoria is normally in orthophoria. Covering causes the eyes to return to a specific location. When uncovered, the eyes return to orthophoria.




Just like the tropia, the phoria is classified into four categories.

 Just like the tropia, the phoria is classified into four categories.




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