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Madonna and John’s resolution comes months after the latter revealed his eyesight has been deteriorating after he had a severe eye infection last summer.

Their poor eyesight and slow swimming speed make river dolphins especially prone to collisions with boats and other obstacles.

Sir Elton John has said he can't see his sons playing rugby after an infection last summer left him struggling with his eyesight.

Amid the ensuing gore, played for cheap chuckles, Ridley is splashed with the unicorn’s purple blood, which clears up her acne and gives Elliot perfect eyesight.

Blood circulation is also affected, and fluid shifts can also impact eyesight.