Complex sentence: The regularity of retinal mosaics can be quantitatively studied by treating each cell as a single point and using spacial statistics such as the Effective Radius, Packing Factor and Regularity Index.
Split into simpler sentences: The regularity of retinal mosaics can be quantitatively studied by modelling the mosaic as a spatial point pattern. This is done by treating each cell as a single point and using spacial statistics such as the Effective Radius, Packing Factor and Regularity Index.