Flow diagram of study selection. Figure 1 is a flow diagram study selection based on pre-specified eligibility criteria. A total of 384 potentially relevant papers were identified. After de-duplication, 290 citations were screened based on their titles and available abstracts. Following the exclusion of 235 citations, 55 full text papers were retrieved for detailed examination. A total of 22 papers (relating to 17 studies) matched the eligibility criteria. Of these, one unique study involved the simulation of visual acuity levels of AMD in members of the general public. Studies that assessed ocular patients with an unspecified DR or AMD population provided information related to vision in the worse-seeing eye but were less useful for examining the relationship between HSUVs and vision. In all, 9 studies had data that could be used in the analysis of the impact of visual acuity on elicited preferences.