Prospective, Randomized, Controlled Agreement and Reproducibility Clinical Study

"The order of testing (two VDAP home environments and ETDRS) will be randomly assigned for each subject as one of four sequences:~1. V1, E, V2~2. E, V1, V2~3. V2, E, V1~4. E, V2, V1~Where E denotes the ETDRS assessment, V1 denotes the VDAP assessment in home environment 1, and V2 denotes the VDAP assessment in home environment 2.~The randomization will be blocked in groups of 4 subjects to ensure balance for the VA testing sequences."