OPTICS
Set to 4 different clues across 5 published puzzles, most often “Field of vision?” — The New York Times, Thursday, 1 December 2005.
6 letters
Every clue on record, most used first
- Field of vision?2 times
The New York Times — Thursday, 1 December 2005
- High-tech subjectonce
The New York Times — Saturday, 8 May 1999
- Branch of physicsonce
The New York Times — Thursday, 21 August 1997
- Study of lightonce
The New York Times — Sunday, 19 June 1994