The process of cementing is defined as the creation of a composite lens from two or more lenses; and different types of lenses with similar refractive indices to eliminate or reduce optical defects, including various types of aberrations (spherical and chromatic aberration, etc.), and to achieve high resolving power for forming an image of the object within the visible field. This may result in a zero-resolution lens in the reading field. Today, however, programmed machines are used to obtain mechanical and optical dimensions with high accuracy and without any deviations in the work, including lens curvature and the removal of air gaps during production and inspection processes before and after production for various types of lenses. This makes them easy to bond and free from optical aberration. Head of Optometry Department Asst. Prof. Dr. Munther Samin Shaker University of Al-Mustaqbal – The First and Leading Private University