What is the first thing you should check if the alignment target appears blurry on a tonometer?

Question

Quizplus · Accepted Answer

Clean the annular aperture of the objective
The first thing you should check if the alignment target appears blurry on a tonometer is the annular aperture of the objective. The annulus can accumulate oil from patients' eyelashes and cause a blurry alignment target. It can be cleaned with a dry, cotton-tipped stick.

What Is the First Thing You Should Check If the Alignment