monocular

"My sister is painting her bedroom walls a cheerful yellow. "

"The student adjusted the eyepiece of the microscope to get a clearer view of the cells. "

"The student adjusted her chair so she could see the board better. "

"The student used a microscope to see the tiny cells in the plant leaf. "

"The family prioritized security by installing a strong lock on the front door. "

"The farmer placed a large rock as a landmark to show where the field ended and the forest began. "

"The teacher distinguished the students' excellent essays from the others based on their insightful analysis. "

"The new shoes are suitable for playing sports. "

"Using the telescope, the student was able to observe the craters on the moon clearly. "

"Being a gentleman, Robert was entitled to shove other commoners into the gongpit but he still had to jump out of the way of the knights to avoid the same fate himself."

"Using the binoculars, Sarah could clearly see the distant mountains from the schoolyard. "

"The word "record player" is a retronym, because "player" was added to distinguish it from modern music streaming services. "