BackgroundTo explain the concept of the Castrop lens power calculation formula and show the application and results from a large dataset compared to classical formulae. MethodsThe Castrop vergence formula is based on a pseudophakic model eye with 4 refractive surfaces. This was compared against the SRKT. Hoffer-Q. https://thegreensjunglebeautyshops.shop/product-category/nailbrush/