Why are high index lenses thinner?

High index glass lenses are extremely dense, making them heavier and much more reflective than plastic lenses. Just as you use sunscreen to help keep the sun’s Ultra violet rays from harming your skin layer, UV treatment in eyeglass lenses blocks those same rays from damaging your eyes. Overexposure to ultraviolet light is thought to be an underlying cause of cataracts, retinal damage and other eye problems. It’s up to 10X more impact-resistant than high-index lenses and is which means ideal lens material for sports protective eyewear and children’s glasses. Most opticians would agree a prescription over a minus 7 or a plus 5 should be produced with high-index lens materials. With prescriptions of the power, the reduced thickness with high-index will make-up for the increased weight.
Though aspheric lenses offer advantages for all prescriptions, they are particularly beneficial for anyone who is farsighted. Aspheric lenses help reduce the magnified, “bug-eye” look due to regular, highly curved lenses for farsightedness, and they greatly reduce the “bulge” of the lenses from the frame. And since they have a slim profile, aspheric lenses have less lens mass, making them much lighter. Aspheric lenses provide superior peripheral vision compared with conventional lenses. Furthermore, prescription glasses for farsighted prescriptions can sometimes result in a bug-eye look as the thickness of the lenses magnifies the wearer’s eyes. High-index lenses don’t have this problem because they are made with an aspheric design. The aspheric quality of the look of the lenses helps keep the biggest market of the lenses thinner so the curvature is flatter, which means your eyes won’t be as magnified.

For example, this sort of lens is often used by fishermen who work in bright light that’s being reflected off the water. Aspheric lenses may also be much lighter in weight than standard spherical lenses. For example, some offer protection from the glare of computer screens.

Lens Index Range

That’s why a lens created from a 1.67-index material could be significantly thinner when compared to a standard-index (1.50) plastic material with the same prescription. Discovered that 75% of high prescription patients have a desire to have more attractive and discreet eyeglass lenses. High Index lenses offer you the ability to give them the thinnest, lightest lenses they have ever worn.

  • People with a solid prescription usually want the thinnest and lightest lenses possible.
  • However, the weight of high-index lenses depends upon how dense the material is.
  • A lens with a higher index of refraction tends to reflect light more than standard CR-39 plastic or glass lenses.

While both regular and high index lenses function just as, high index lenses are made to bend light more efficiently — leading to thinner and lighter lenses. Generally, the higher your prescription, the bigger the index you need.
A high-index eyeglass lens allows people with a stronger prescription to wear a lens that is lightweight and thin. This ensures more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high.

Are Titanium Glasses Frames Worth It?

It all really depends upon your personal preferences and, most importantly, your prescription. High-index lenses are more expensive, and when you’re considering making the investment, it’s good to learn why you should or should not splurge on them.

EyeBuyDirect has a wide selection of budget frames starting at $6. Polarized filters reduce glare off horizontal surfaces, such as for example road surfaces and water.
High index lenses are thinner because they’re designed to bend light more efficiently. These lenses provide 100% protection from the sun’s Ultra violet rays and are available in a multitude of lens materials and designs, including bifocal and progressive lenses. High-index lenses imply that the lens itself can be both thinner and lighter. This enables your glasses to be as comfortable and fashionable as possible. High-index lenses are particularly beneficial should you have a strong eyeglass prescription for nearsightedness, farsightedness, or astigmatism.

Polycarbonate lenses are very difficult lenses to tint and are not recommended for those who want custom dark sunglass lenses . The suggested prescription range for polycarbonate lenses is plano to +/-6.00 sphere. If you haven’t been to the eye doctor in a while, you might be surprised by how many eyeglass lens types are available. You can pick the eyeglass lens material that meets your needs and lifestyle. You can choose the lens materials and coatings that match your look and vision needs.
Recommending an inferior, as something to check the lenses, can lead to a decentration of only 4mm each. A less severe frame shape such as an oval means you will see less thick lens edge in the eyeglasses. These decisions, combined with a 1.74 index and an aspheric design, mean you will see much thinner lenses in the frame. Inside our new example, each factor worked toward the same goal, thinner, more attractive lenses. Index of Refraction may be the speed of light in vacuum pressure divided by the speed of light in confirmed material. The resulting number (1.5, 1.6, 1.67, 1.74) is known as the “index.” The bigger the quantity, the more light is slowed down or bent.

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