OVVA
                                Omnidirectional Virtual Visual Acuity (OVVA) is a new user-centric VR clarity metric. OVVA measures and compares the virtual visual acuity of the central, focal area of a VR HMD and environments and their degradation in the noncentral areas. 
                            
                        How to download and setup OVVA
Open terminal and run command
                                            git clone https://github.com/Chaosikaros/OVVA.git
                                        
                                        git clone is used to create a copy or clone of OVVA repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with OVVA https://github.com/Chaosikaros/OVVA/archive/master.zip
Or simply clone OVVA with SSH
                                            [email protected]:Chaosikaros/OVVA.git                                    
                                    If you have some problems with OVVA
You may open issue on OVVA support forum (system) here: https://github.com/Chaosikaros/OVVA/issuesSimilar to OVVA repositories
Here you may see OVVA alternatives and analogs
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