Your Rx is what an ophthalmologist (an MD) or optometrist (a doctor of optometry) provides to correct your vision with a pair of eyeglasses with corrective lenses.
Here is a list of some optical abbreviations that will help you order your glasses from Cyxus:
You bet we can!
Most people have an astigmatism. If you have an astigmatism on your Rx, we can make glasses that will correct it.
If you do not receive your parcel within this period of time, please do not hesitate to contact us.
Currently we don’t offer them on them on the website, but please contact firstname.lastname@example.org if you want us to make custom bifocal or progressive lenses for you!
At the same time, there is less need for a high index if you have a very low prescription. If you are already at -2.00 diopters or less, spending the extra money will make no noticeable difference for you. A mid index 1.57 is plenty in this -2.00 diopter scenario.
Once you get close to -5.00 diopters, moving the index higher to a 1.61 is a good idea, if it fits your budget.
From there, if you have a prescription over -6.00 diopters, a 1.67 high index lens is a worthwhile upgrade. It is with those thicker lenses at higher prescriptions, that we start to experience optical distortion that is notable when wearing that correction for many hours every day.
Optical distortion, increasing as you increase prescription strength, adds unwanted eye strain.
At -8.00 diopters or more, you will want to spend the extra, and go all the way to a 1.71 high index.