The refractive index is the number that represents how efficiently a lens material bends light, and is dependent on how quickly light travels through the material.

High-index lenses can improve lens comfort and appearance, and can even open the door to a larger variety of frames.  High-index lenses may be just the solution you have been searching for.

Also, as opposed to lenses for nearsightedness which are thicker on the edges, lenses for farsightedness are thicker in the center. With regular lenses, this can significantly magnify your eyes and may make you feel a bit self conscious at times.

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While both regular and high index lenses function in the same way, high index lenses are designed to bend light more efficiently — leading to thinner and lighter lenses.

The depth of field (DOF) is the distance between the nearest and the farthest objects that are in acceptably sharp focus in an image captured with a camera.

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High-index lenses are eyeglass lenses that are designed to be thinner and lighter than regular lenses. They are generally recommended for people who have significantly high refractive errors and strong prescriptions for nearsightedness, farsightedness, or astigmatism.

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The new AlignRT frameless SRS module has just received 510(k) clearance from the FDA. This offering utilizes Vision RT’s latest HD camera technology, includes an advanced calibration solution for ensuring the precise alignment of AlignRT with the beam iso-center, and the 3Degree head adjuster which allows precise corrections for pitch, roll and yaw rotations with open mask immobilization.

Before choosing high-index, speak with your eye doctor to determine if these lenses are necessary for your individual prescription.

If you have a strong prescription and are looking for thinner, lighter lenses with a more attractive appearance, high-index lenses are the way to go.

Many eye care professionals also recommend adding anti-reflective and anti-scratch coatings to high-index lenses to improve vision and lens durability — this will further increase the overall cost of your new eyeglasses.

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The transmission spectrum chart indicates that from 250nm to 2800nm, fused silica glass has very high transmission rates.

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Regular lenses for a strong farsightedness prescription can be quite heavy. High-index lenses however, don’t require as much lens material and will result in longer lasting comfort.

According to this table, a lens with an index of 1.74 could be up to 50 percent thinner than a regular plastic lens with an index of 1.50, with the same optical prescription.

High-index lenses are generally scratch resistant and can fit into almost any type of frame. They can also be treated with anti-scratch, anti-reflective, and UV-protection coatings to improve vision and lens durability.

The image below compares the lens thickness of a regular plastic lens (1.50) to the most commonly prescribed high-index lenses.

Regular lenses that contain a strong optical prescription usually require a thicker and heavier lens in order to bend light more effectively and correct the high refractive error.

Also, it is important to know that high-index lenses are typically more fragile than regular lenses and need to be handled with a bit more care.

While high-index lenses can be beneficial for certain optical prescriptions, they can also be more expensive than regular lenses.

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Vision RT announced that it will use its exhibit at this year’s American Society for Radiation Oncology (ASTRO) meeting in San Francisco to highlight its cutting-edge optical guidance technology.

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With thinner high-index lenses, you will no longer need to worry about the appearance of your lenses and you will gain a larger variety of frames to choose from.

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Hello, has anyone used the Mitutoyo M Plan Apo 10x lens? I am trying to find the back focal plane position of this objective lens.

Jul 26, 2023 — To calculate a magnification magnitude, divide the distance of the image created by the lens from the distance of the object to the lens.

More recently, the newest trends in eyeglass frames include plastic and metal rimless frames, as well as frames that contain thinner rims which expose the edge of the lens.

Oct 13, 2024 — How is a microscope's magnification calculated?Total magnification is calculated by adding the eyepiece power to the objective lens power.Total ...

Polycarbonate lenses are impact resistant and offer increased durability, but are generally only recommended for children’s glasses, sports eyewear and safety goggles because they don’t provide the same level of visual clarity, when compared to other plastic lenses.

September 30, 2011 — Vision RT announced it has increased sales of AlignRT, its 3-D imaging platform, to several advanced TrueBeam facilities in the United States in recent months.

The S-Mount Lens has a standard mount with a M12X0.5 thread, so called it M12 lens. We also call it board lens and miniature lens.

This index is adequate for correcting mild to moderate refractive errors, but is not as effective for the correction of higher refractive errors.

A lens for nearsightedness is designed to be thinner in the center but thicker around the edges. With a strong prescription and regular thick lenses, your choice of eyeglass frames will be limited— especially if you were hoping to purchase rimless or semi-rimless frames.

High-index lenses contain a unique aspheric design which facilitates a flatter lens curvature, leading to reduced magnification and improved appearance.

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With a thicker lens, these types of frames can be less attractive and also more difficult to wear, as thicker lenses are not as secure within the frame and are more likely to pop out.