How do I know the base curve of my contacts?
Typical values for a contact lens are from 8.0 to 10.0 mm. The base curve is the radius of the sphere of the back of the lens that the prescription describes (the lower the number, the steeper the curve of the cornea and the lens, the higher the number, the flatter the curve of the…
Typical values for a contact lens are from 8.0 to 10.0 mm. The base curve is the radius of the sphere of the back of the lens that the prescription describes (the lower the number, the steeper the curve of the cornea and the lens, the higher the number, the flatter the curve of the cornea and the lens).Click to see full answer. Similarly, you may ask, 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. 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. Subsequently, question is, what is the difference between 8.6 and 8.7 base curve? ” No, the difference is small. The 8.7 curve is . 1mm flatter, but since these are soft lens curvatures, and soft lenses assume some of the shape of the cornea, the fitting value won’t be changed dramatically.What happens if you wear contacts with the wrong base curve?It is just like wearing wrong size shoes for your feet. If the base curve is smaller, it can cause shortage of oxygen in the cornea and even congestion in the eyes. If the base curve is larger, the contact lenses will slide in your eyes and cause discomfort.
