– Recent online optical illusions, like NFL pundit and floating ships, spark confusion.

– A new illusion on X shows a striped circle with hidden numbers, challenging viewers.

– Over 28,000 people attempted to guess the number, with varied responses.

– Some jokingly questioned if medical appointments were needed due to the optical puzzle.

– One person suggested 3,452,839, revealing the correct answer for those with good contrast sensitivity.

– Contrast sensitivity is crucial for perceiving clear outlines and differences in shading.

– Poor contrast sensitivity can lead to real-life issues, including challenges with driving in rain and fog.

– Opticians often use tests like the Peli Robson test to assess contrast sensitivity and visual clarity.