(from All-American Comics #24, cover-dated March 1941)
The original
Dr. Mid-Nite (note the spelling) first appeared as a feature in All-American Comics #25 (April 1941), a book that already was home to such features as
* Green Lantern (Alan Scott)
* The Atom (Al Pratt)
* Scribbly and the Red Tornado (Ma Hunkle)
* Hop Harrigan
NOTE: both Scribbly and Hop Harrigan had been features in the book since back in issue #1, cover-dated April 1939
He was a character who was blinded, but then gained special vision abilities as a result. (Mind you, this was more than twenty years before Marvel's Matt Murdock saw the light of day, but almost two years after District Attorney Anthony Quinn (The Black Bat) had been blinded and later gained the ability to see at night in the pulp magazine Black Book Detective.)
From Dr. McNider's origin story:
to be continued . . .