What Prescriptions Go With 1.67 High Index Lenses?
1.67 high index lenses are something your eye doctor may have suggested but if you’re new to this type of lens or even having to wear eyeglasses in the first place, you probably don’t know a lot about it or why you should choose it. While your eye doctor may tell you a little bit about them, this article will give you more information about the 1.67 lens and why it may be a good fit for your lifestyle. Then, you are able to make an informed and educated decision on what is right for you when it comes to your eyeglass lenses.
What Type of Prescription is Right for the 1.67 High Index Lenses?
The 1.67 high index lenses are ideal for those with stronger prescriptions. These particular lenses cover SPHs of -20.00 / +10.00 or lower and CYLs of +/- 6.00 or lower.
Differential prescriptions (close-up), at low diopters (less than -3.00 diopters) are also ideal candidates for this type of lens.
What is Special About This Type of Lens?
These lenses are made out of a high index polymer. What that means is that the lenses are thinner but still work for a strong prescription. Years ago, if you had a strong prescription for eyeglasses, the lenses were very thick and everyone knew that you had vision problems. In fact, these lenses were often referred to as coke bottle glasses simply because the glass was so thick that it resembled the same glass used for the soda.
These lenses are much thinner than other lenses like the 1.50 standard index, 1.53 Trivex, 1.57 mid-index, 1.59 polycarbonate, and the 1.61 high index lenses.
It makes the edge thickness thinner for both nearsighted ( – ) prescriptions and the same for ( + ) center thickness farsighted prescriptions. Your vision is also improved due to the aspheric lens surface and this also decreases the vision distortion others see when wearing them.
There is a rule of thumb that for those who have a high prescription, the higher index lenses are the way to go.
If you have a prescription over -6.00 diopters, this is an upgrade that is a worthwhile choice. In fact, those who wear a strong prescription are more likely to experience optical distortion, especially after wearing the lenses for a long period of time, such as daily.
What Are Some Other Reasons to Invest in High Index Lenses?
Choosing lower index lenses may be less expensive but there is a problem some experience with cheaper lenses. Distortion is sensitive for some and some also find it harder to focus as easily. There is also the factor of fewer clear flashes.
Of course there are aesthetic issues as well. If your prescription calls for a strong one due to your eyesight being poor, a lower cost set of lenses is going to be thicker, as mentioned above. This means that the eyeglasses will not be as attractive and will have more glare.
These thicker lenses are also more uncomfortable to wear because the lens itself is thicker and have more weight. This may make the lenses slide down on the face easier and be heavy and cumbersome.
High index lenses are available for sunglasses as well so you do have the option of choosing those for all of your vision needs; they’re not just for eyeglasses.
Final Thoughts on 1.67 High Index Lenses and Why to Choose Them
The bottom line is that yes, high index lenses are going to cost a bit more than the cheaper low index counterparts. However, when you factor in the aesthetic quality, the distortion issues that are a possibility, and the fact that they are heavier and thicker, the decision is more clear, so to speak.