Lenses that Fell Out of Frames

Chaim looked at the clock after he woke up from his Shabbos nap and was shocked to see that it was almost four o’clock in the afternoon.

“Oy, I am ten minutes late to my chavrusa!” said Chaim and rushed out of the door.

He ran down the street that led to the Beis Medrash. Unfortunately, he did not notice a branch that was in his path, and tripped over it. Chaim fell and his glasses went flying forward. Boruch Hashem, he was not hurt, but when he picked up the glasses and put them on, he realized that one of the lenses had fallen out.

Chaim looked for it on the ground and quickly spotted it. He was about to reach for it, but then he stopped himself and thought, “Maybe the lens is muktza now!”

Question: May Chaim pick up the lens?