The base curve of a contact lens refers to the curvature of the back surface of the lens. The base curve is measured in millimeters and is typically between 8.4 and 8.8 mm. The base curve is important because it needs to match the curvature of the cornea, the clear front part of the eye, in order to provide a comfortable fit and good vision. A lens with a base curve that is too steep or too flat may not fit properly and can cause discomfort or vision problems.
In general, the difference between a base curve of 8.4 and 8.6 is small and may not be noticeable for most people. However, it is still important to choose the correct base curve for your lenses in order to ensure a comfortable fit and good vision. Your eye care provider can help you determine the correct base curve for your lenses. It is also important to follow the fitting and care instructions provided by the manufacturer to ensure that your lenses fit properly and remain comfortable.
