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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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Anisometropia


- Point -

 Anisometropia - Vertical prismatic imbalance characterized by unequal power and prismatic effect at the reading level.



- Point Word-

  • Anisometropia

  • Reading level (near work)

  • Vertical prismatic imbalance



- Explanation -

The glasses of the monofocal lens are mainly focused on long-range calibration. Therefore, the position of the optical center point of the lens to be corrected is located on the viewing axis from a long distance. When looking at a short distance, the viewing axis faces downward. At this time, the prism effect occurs because the viewing axis deviates from the optical center point. If the amount of prism generated during short-range viewing of the glasses lens to be corrected exceeds 2 diopters, the balance of both eyes is lost due to the large difference in the amount of prism generated during short-range viewing. This state is called Anisometropia.

 The glasses of the monofocal lens are mainly focused on long-range calibration. Therefore, the position of the optical center point of the lens to be corrected is located on the viewing axis from a long distance. When looking at a short distance, the viewing axis faces downward. At this time, the prism effect occurs because the viewing axis deviates from the optical center point. If the amount of prism generated during short-range viewing of the glasses lens to be corrected exceeds 2 diopters, the balance of both eyes is lost due to the large difference in the amount of prism generated during short-range viewing. This state is called Anisometropia.






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