What Is The Difference Between High Index And Polycarbonate Lenses
They give you crisper and more detailed vision, while still protecting your eyes from UVA and UVB rays. The thinnest option available and created for those with the highest prescriptions, 1.74 high index lenses are the optimal choice assuming you have a high prescription.
- On the downside, polycarbonate isn’t the best choice in order to tint your lenses.
- While no lens is scratch-proof, this special coating does make lenses harder to scratch when dropped or rubbed against a difficult surface.
Listed below are some trusted online retailers offering high index lens options. The refractive index generally defines the kind of high index lens a person has. Plastic lenses, referred to as CR-39, have a refractive index of 1 1.5.
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Your optometrist or optician will be able to determine what sort of lens is best for your prescription, and we always recommend following their advice. Our optometrist and staff are pleased to help guide you in your lens selection.
- Polycarbonate lenses have consistently proven to be probably the most impact-resistant lenses available.
- Are you aware that other questions, longevity of the lenses isn’t a major concern as they are only needed for another 3 months or so.
Now that we’ve a brief overview of polycarbonate lenses why don’t we consider a few of its benefits and drawbacks. This is primarily due to the high optical clarity, low cost, impact-resistant, and durable property. Generally speaking, the higher the index of refraction of a lens material, the higher the cost. The weight of high-index lenses depends on a factor called the specific gravity of the lens material. 25% thinner than 1.5 index lenses; 1.67 index lenses are approx. 40% thinner than 1.5 index lenses; 1.74 index lenses are approx. 55% thinner than 1.5 index lenses; In addition to the above Double Aspheric lenses are flatter than standard High Index Plastic lenses, so there is less curvature is the lens.
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Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Through her writing, Dr. Huang enjoys educating patients on how to lead healthier and happier lives. She also has a pastime in Eastern medicine practices and studying integrative medicine. When she’s no longer working, Dr. Huang loves reviewing new skincare products, trying interesting food recipes, or hanging with her adopted cats. EyeBuyDirect has a wide variety of budget frames starting at $6. At PlasticRanger, we enlighten our readers with all the current happenings in the wonderful world of plastics.
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