Derryberry was reported, a blind 20-year-old man who could clearly recall every day of his life since the age of about 11. Derryberry had been born at 27 weeks, weighing just over  and was in neonatal intensive care for 96 days. A severe brain hemorrhage was the likely cause of cerebral palsy, and his prematurity resulted in congenital blindness.
Derryberry's condition was recorded, a blind 20-year-old man who could remember every day since age 11. Premature birth at 27 weeks caused a severe brain hemorrhage leading to cerebral palsy and congenital blindness.