Hello and welcome to Case of the Day. I’m Dr. Croley, and today we’re shifting gears and we’re gonna reserve discussing a patient, we’re gonna talk about glasses and different types of lenses that you can choose depending on your prescription and your refraction. People who have very large refractions, that is they are very nearsighted or very far-sighted, have very thick lenses. Now there are ways to get around that so now your lenses don’t have to be so thick. So we have a couple of my opticians here who’ll gonna go over what the different types and choices of lenses you have if you have a very strong prescription. So take it away.
Optician 1: Okay. So, two examples that we have just to give a little bit of a, more of a visual aid, is most glasses, they’re made with plastic, which in the optical we call it CR39. This is a pretty fairly high prescription lenses coming around blank. So we had it cut in half so that way we could see. This is the same prescription, one in the CR39 which is plastic and this is the polycarbonate. So this is an impact-resistant lens, thinner, lighter, and also you can tell by the edges that they’re more polished. You don’t get kind of that yellowy thick look…
Dr. Croley: So I’m gonna come a little closer and so you can see the difference in the thickness of these lenses. Okay? So that’s the difference.
Optician 1: Of course, cosmetically you’re gonna get that nice, thinner look of lens. You won’t have the Coke bottles or the real thick edges on the edge of the glasses. Some of the, what we like to call kind of medical benefits is the fact that it is lighter and it’s impact-resistant. So we put a lot of people, like safety lenses for kids up to the age of 16 should be in them. Because if they are outside and they get hit with a kick ball or if they fall off their bike, their lenses won’t shatter. Plastic, believe it or not, can still shatter if something already hits your eye. With a polycarbonate, if it hit it, he would get almost like that spiderweb effect but it would not shatter, so it’s kind of like a safety thing too.
Dr. Croley: Good for kids.. Alright..
Or someone who has only one eye then you may consider doing this kind of lens because you’re trying to protect that one eye. Of course, no one wants to lose any eye, but if you only have one, you certainly want to protect that. Even though this is a great lens, there are some disadvantages, in that some people, the reason it works differently is that this lens is denser, so light bends faster with less thickness. So that’s how we get rid of the thickness because of the refractive index inside the lens. The difference is that some people, just like there’s people who get motion sick, who can’t tolerate motion in cars, some people are so used to like being bent in a certain way but on rare occasion, someone would say, “This doesn’t feel right”. There’s a few people, very small number, who just can’t get used to that type of refractive index and we have to switch them back out. But that’s pretty uncommon. But just to let you know that this isn’t a for sure, for sure guarantee but it is certainly the way to go if you have a very strong prescription and you want to get lighter lenses, safer lenses, and a cosmetic, better-looking pair of glasses, this is the way to go.
So if you have any other questions about anything about this or anything else, you can always contact us through the website, if not may God grant you healthy eyes and great vision.
Optician 1: Bye…
Optician 2: Thank you..