When ordering your prescription lenses, you will often be asked what thickness you would prefer them to be. It can be a little complicated, so here's a quick breakdown of what the heck things like the refractive index are.
It's easy to get complacent about contact lenses and understandably so – sometimes you may forget you even have them in! However, as comfortable as they may be, it's important to keep a few things in mind when wearing them.
Whether you're new to having your eyes checked or if you've been wearing glasses or contact lenses for years, your eye prescription is used to know exactly what requirements (if any) are needed to correct your vision.