The difference between 1.67, which is considered regular index and 1.74 is quite small, and really, the only way you'll notice the difference is if you have a prescription below a -6 or above a +4. However, if you are in need of a very strong prescription, it is absolutely worth the additional cost!
What does 1.61 index lenses mean?
1.61 High Index 1.61 High-Index lenses bend light more efficiently and have thinner edges than lenses with the same prescription power made of conventional plastic material. They require less material, which reduces their overall weight.
Do thinner lenses make a difference?
With a thinner material in most cases wearers do not notice a difference. But this is highly dependent on how sensitive the wearer is. In some cases the wearer can spot the difference between a thinner lens and a standard lens material which is thicker.
Is there a big difference between 1.67 and 1.74 lens?
The difference between 1.67, which is considered regular index and 1.74 is quite small, and really, the only way you'll notice the difference is if you have a prescription below a -6 or above a +4. However, if you are in need of a very strong prescription, it is absolutely worth the additional cost!
When do you use 1.67 high index lenses?
1.67 High Index It helps with eye distortion caused by stronger prescriptions and is ideal for individuals with an SPH correction between +/- 7.00 and +/- 9.00, and a CYL correction between +/- 3.25 and +/- 4.00.
Do high index lenses make a difference?
For traditional glass lenses, the refractive index is about 1.53. ... That means that lenses with a higher refraction index can be slimmer and lighter, which is why the superior light-bending abilities of high index lenses make them ideal for eyeglass wearers who require a stronger prescription to correct their vision.2020-09-08
Is 1.61 A high index?
High-index lenses have good optical clarity, 100% UV protection, and excellent durability. They currently come in indices of 1.61, 1.67, and 1.74. All three lenses are made with similar materials, so the choice of index comes down to your prescription strength. A 1.61 high-index lens is best for +5.00/-7.00 or above.2021-02-09