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Dominic Cummings claims coronavirus affected his eyesight - is poor vision a symptom?

Boris Johnson's chief adviser has defended visiting a beauty spot during lockdown, claiming he was testing whether his vision was strong enough for a longer drive. Cummings believes he was struck down by the coronavirus after his wife developed suspected symptoms, but neither were tested. Amid the backlash Cummings is facing, experts are questioning whether poor vision is a side effect of the infection.