What the Cross-Eyed Tutor Had Trouble Controlling?

This page is the CodyCross answer for the clue below from The 1950s, Group 1817, Puzzle 2 (Pearl Necklaces).

Question is: What the Cross-Eyed Tutor Had Trouble Controlling?

and the answer is: PUPILS

Word Meaning:

PUPILS — plural of pupil

Definitions from Wiktionary.