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High Index Lenses

High Index Lenses or High RX Lenses are specially made to accommodate those people with higher prescriptions.  The stronger the prescription, the thicker the lens that is required to accommodate it.  As a prescription get above +/- 3 diopters the lenses will become thicker at the edge or the middle.

To combat this, we would recommend using higher refractive lens materials also known as high index lenses.  These types of lenses are generally thinner at the edge or centre thickness and have higher refractive power due to increased optical density.

This type of lenses material can be much lighter than its counterparts.


There are certain advantages for those wearing higher index lenses:

  • Thin profile. High index lenses are thinner than standard lenses, making them more aesthetically pleasing and making your prescription seem weaker than it is. A thinner profile means a weaker prescription in general.
  • Lightweight. High index glasses are lightweight because of their thin lens profile.
    Less lens material means less weight on your nose all day.
  • Scratch resistance. High index lenses are denser than standard plastic or polycarbonate lenses, making them more scratch resistant. This is extremely useful for everyday glasses as it increases their lifespan and saves you money on a new pair in the long run.
  • Less eye distortion. Many people with strong prescriptions have to deal with the “bug-eyes” or “tiny eyes” distortion that comes from thick lenses. Thick, strong lenses can distort the way your eyes look to others, making them seem smaller or larger than they are. This is embarrassing and unattractive. High index lenses remove much of the eye distortion associated with high prescriptions.
  • More prescription options. In curved frames and some frames with special lens pockets, there is a limit to how thick a lens can be. High index lenses allow higher prescriptions to be inserted into many of these frames, broadening your frame options when you are on the cusp.

Consider reading our posts below to help you get the right prescription safety glasses for you

Lens Materials

Digital Single Vision Lenses



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