An eye doctor measures several factors to ensure a safe fit, including: The curvature of the back of the lens. Diameter (DIA): The total width of the lens.
A "one-size-fits-all" lens can lead to serious complications if it doesn't fit your eye's unique shape. The Risks of "Prescription-Free" Lenses buy contact lenses no prescription
Ensuring the lens allows enough oxygen to reach your cornea. An eye doctor measures several factors to ensure