Cataract surgery can completely remove the cataract. Ideally, vision is fully restored as a result. However, sometimes there are other eye conditions in addition to the cataract. If there is also macular degeneration, for example, the visual field will brighten after the operation and orientation will improve again. However, reading ability can only be restored to the extent permitted by the condition of the retina and the macula. The retinometer test is used for an objective functional assessment of the macula and can provide a guideline for predicting the expected improvement in vision.