oculars

"Clouds were forming interesting shapes in the sky. "

"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. "

"as clear as crystal"

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

"The violinist was a master of her instrument."

"The arrangement of chairs in the classroom made it easier for the students to see the teacher. "

"He examined the crime scene for clues."

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"Her voice was distinct despite the heavy traffic."

"The scientist studied the effects of different types of soil on plant growth. "

"Strabismus is an optical defect."