Is ar coating "matched" to index of lenses?

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Jennie Simonis asked a question: Is ar coating "matched" to index of lenses?
Asked By: Jennie Simonis
Date created: Fri, Jul 30, 2021 4:54 PM
Date updated: Wed, Sep 28, 2022 2:28 PM

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Top best answers to the question «Is ar coating "matched" to index of lenses»

  • This is due to "birefringence", seeing the reflection of light coming from two different index materials. Most AR hardcoats today have an index that matches most closely to that of CR-39 . Therefore, seeing this oily/wavy appearance of the AR on high index lenses is not uncommon, especially when the lens index is over 1.67. In years past, there were a much wider variety of AR hardcoat indexes that labs would use so that they could match the AR hardcoat index better with the lens index.
  • Antireflective coatings have their own index of refraction, more specifically, the hardcoat that adheres the AR to the lens has its own index. When this index does not match the index of refraction of the lens, the result can be an AR coating whose reflection looks like an oil slick. This is due to "birefringence", seeing the reflection of light coming from two different index materials.

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