Gabe Brown uses both an eye-controlled computer pad and a simple alphabet board to discuss his recovery from a severe traumatic brain injury.

Eye patients sometimes assume that their vision screenings required for obtaining a driver’s license or certain certifications are equivalent to comprehensive eye exams. However, that isn’t the case.

Only people with exceptional intelligence and vision—like Superman himself—will be able to find the hidden O in this illusion filled with tricky Qs. If your IQ is 115 or above and you trust your eye ...