1.90 High Index Glass Lenses

1.90 High Index Glass Lenses are the thinnest eyeglass lenses with an ultra-high refractive index, designed for very strong prescriptions.  This high index glass with a refractive index of 1.90, which is a material engineered to bend light more effectively, resulting in thinner They are the thinnest available lens available.   

Key characteristics of 1.90 high index glass lenses:

• If your main desire is thinness, there are no thinner lenses than 1.90 high index.
• 1.90 high index lenses are only available in glass. Currently, no plastic lens materials reach an index of 1.90.
• 1.90 is a particularly dense glass material, so the lenses are going to be considerably heavy. If you are planning on ordering 1.90 high index lenses, it’s a good idea to look for a frame with the smallest lens size possible to reduce the weight.  They also look much better in an oval or round frame shape.
• 1.90 high index lenses are going to be more expensive than any other lens material.
• 1.90 high index lenses are generally only available for single vision or progressive prescriptions.
• Abbe number refers to color aberration, which is the amount that your lens blurs edges and colors, especially in your peripheral vision. Aberration causes things like “color bleeding,” where it seems like a rainbow is peeking out from behind the edge of an object. 1.90 high index lenses generally have the lowest Abbe number of any lens (between 20 and 35), leading to the most (worst) color aberration.
• Because of its low Abbe value, 1.90 high index is a poor choice if your prescription has prism.
• 1.90 high index lenses cannot be tinted and are generally only available in clear.
• Because of their thinness, these lenses are extremely good at getting rid of the “bug eye” and “tiny eyes” look that’s associated with strong prescriptions.
• 1.90 high index lenses are most useful for extremely high prescriptions.

These lenses aren’t right for everybody, and most people who go with high index lenses prefer 1.70 high index glass because of the optical clarity and cost. If thinness is extremely important to you, your prescription is extremely high (below -10.00 or above +7.00), you are very concerned with having as little of the “bug eye” or “tiny eyes” look as possible, you do not have a prism, and you are comfortable with dealing with color aberration, 1.90 may be the lens for you. 

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