My optician said that if I miss a click on the field test the flashing dot will reappear
So did mine; He also said you can't second-guess by clicking at random hoping to get some positives, not that you'd want to, it's too serious. The machine knows all the tricks.
I sometimes think it's more a test of my concentration when holding the "clicker" with my mind wandering; it's always a long 5 minutes.
Estranged Son and Future Granddaughter
To think that London, or anywhere else for that matter, does not belong to any one demographic