Usually valid for one to two years (varies by state). Buying Online vs. In-Office
This is a separate step from a standard glasses exam to measure the eye surface. do you need a prescription to buy contacts
You may be given a "trial pair" to wear for a week to ensure comfort and clarity. Usually valid for one to two years (varies by state)
The strength needed to correct your vision. Base Curve (BC): The back curvature of the lens. Diameter (DIA): The width of the lens. do you need a prescription to buy contacts
The specific manufacturer or lens type prescribed.
Not every eye reacts well to every lens material (hydrogel vs. silicone hydrogel).