A fun day at the beach turned into a months-long medical ordeal for a Seattle teenager who went temporarily blind after doing cartwheels with friends.

Deborah Cobb, now 42, was just 19 when she decided to see how many cartwheels she could perform in a row while having fun with her friends on a summer day in 2002.

But after completing 13 consecutive cartwheels, the young woman fell over feeling 'super dizzy' and quickly realized something was terribly wrong with her eyesight.

'I decided to see how many cartwheels I could do in a row just for fun,' Cobb told Newsweek in a recent interview. 'So I started doing them and got to 13 and fell over super dizzy. My eyes were kind of spinning so it took a moment to realize that my eyes weren't focusing.'

At first, she thought she was just dizzy but panic quickly ensued when she realized she could no longer see anything clearly.