Standard Index (1.50):
Mid-Index (1.56/1.57):
High-Index (1.61 1.67 1.74):
High Index Lenses: High-index lenses excel at reducing thickness and weight, making them an excellent choice for individuals with strong prescriptions. They can significantly reduce lens size, thickness, and weight, providing a more aesthetically pleasing appearance.
Polycarbonate Lenses: Polycarbonate lenses are lighter and thinner than standard plastic lenses but are not as thin as high-index lenses. They are suitable for moderate to strong prescriptions and offer good impact resistance.
Regular lenses provide good optical clarity but they are heavier compared to high-index lenses, which can lead to less comfort, especially for people who wear glasses for extended periods.
Here’s a quick overview of the differences in 1.61, 1.67 and 1.74 high index lenses.
Thick:
Weight:
Clarity:
Cost:
Thick:
Weight:
Clarity:
Cost:
Thick:
Weight:
Clarity:
Cost:
Reduced Thickness and Lightweight
Hi-index glasses lenses are significantly thinner and more lightweight than rugular lenses. This is especially helpful for people with high prescriptions and let them more comfortable.
Improved Aesthetics
The thinness of high-index glasses lenses reduces the “bug-eyed” or “shrinkage” effect often associated with strong prescriptions, giving the appearance of more natural eyes.
Better Optical Clarity
Compared to other materials, hi-index materials can reduce chromatic aberration and distortion, offering improved optical clarity.
Cost
Hi-index lenses are typically more expensive than regular plastic or glass lenses due to their specialized materials and manufacturing processes.
Easy to Scratch
High-index lenses are easier to be scratched than some other lens materials, although scratch-resistant coatings can help mitigate this issue.
Limited Availability
Customization options may be limited because not all lens alternatives, such as specialty tints, coatings or visual choices.
If your question is not listed, please email us right now.
If your vision isn’t too bad, regular glasses may work. However, high index lenses are important for individuals like someone who have undergone cataract surgery, received intraocular lenses, and reached the point where contact lenses are no longer an option, particularly with prescriptions of -10 and -11 dioptres.
High-index lenses (1.60 to 1.74) are best for prescriptions around ±6.00 diopters and above, mainly for minimizing lens thickness. Standard CR-39 or polycarbonate lenses are suitable for lower prescriptions, with the exception of rimless or semi-rimless frames, which may expose the thickness of the lens.
Yes, because high index lenses have a higher refractive index, which means that they bend light more efficiently. Because of this, they can be flatter and thinner, which lessens the effect of magnification and minification.
The choice between polycarbonate and high-index lenses depends on your needs. High index lenses are suitable for strong prescriptions but polycarbonate lenses are cheaper.
Generally, if your prescriptions are over +/- 6.00 diopters, you can choose high index lenses, although it depends on personal preferences and the type of frames size used.
It depends on the prescription and type of lenses you are going for. High Index lenses are 1.61, 1.67 and 1.74 indices, and you can choose single vision, blue light or progressive. The details you can contact our sales managers.
