What does base curve mean for contact lenses?
The ‘BC’ or base curve measurement indicates the back curvature of your contact lens, in millimetres. It also means your contact lenses will be less likely to fall out. A lower BC number means a steeper curve of your cornea (the clear front surface of your eye). A higher BC number means your cornea is…
The ‘BC’ or base curve measurement indicates the back curvature of your contact lens, in millimetres. It also means your contact lenses will be less likely to fall out. A lower BC number means a steeper curve of your cornea (the clear front surface of your eye). A higher BC number means your cornea is flatter.Click to see full answer. Likewise, people ask, what is the average base curve for contacts?The base curve, or BC, is the radius of the back of the contact lens, the part that sits on your eye. According to Laser Eye Surgery Review , the average measurement of a base curve is between 8.0 and 10.0. An example of a common base curve would be BC 8.7mm.Furthermore, how do you know your base curve for contacts? Often contact lens manufacturers will only offer one or two sizes—numbers like 8.3, 8.6 or 8.9—and your optometrist will choose the size that would fit you best. The lower your B.C. reading number, the steeper the curve of your eye. Keeping this in consideration, is Base Curve important with contact lenses? Optician’s answer. A base curve measurement represents how curved your contact lens is. This measurement affects how a contact lens sits on the front surface of your eye, and is quite important. Changing this value, even by a small amount, can cause blurred vision and discomfort if it’s not suitable for you.Is there a big difference between 8.4 and 8.6 base curve?Acuvue Oasys contacts come in 8.4 and 8.8 BCs, while other contacts may come in 8.3 and 8.7, or only one curve such as 8.6, in the hopes that its medium curve will fit the majority. There is a difference in fit of the 8.4 and 8.8 lenses. That . 4 difference in base curves is quite significant.
