In the field of prosthetic vision, functional assessment refers to tests that capture a person’s ability to use vision to perform everyday tasks. That includes assessments ranging from basic psychophysical tests of light perception and discrimination to performance-based tests. Visual prosthesis devices are not able to provide high-resolution visual acuity, hence standard vision tests are not sufficient to measure post-intervention improvements in vision. The lack of validation of assessment and reporting of patient wellbeing challenge interpreting the outcomes of clinical studies. Here we review the techniques of Activities of Daily Living assessment as well as the post-implantation training techniques. We explain why there is a need for an update and for a standard method which will enable the comparison of the results between research groups.