Which of the following is the size of the border around the edge of a Mayo tray that is considered contaminated in a sterile field?

A. Stand 25 feet from the Snellen chart. The standard distance for testing visual acuity with a Snellen chart is 20 feet, not 25 feet. Testing at 25 feet would not provide accurate results.
B. Allow them to squint if necessary. Squinting can artificially improve vision, leading to inaccurate results. The patient should be instructed to avoid squinting during the test.
C. Keep both eyes open while using the occluder. The patient should use the occluder to cover one eye but keep both eyes open during the test. This ensures that each eye is tested individually without any pressure or distortion from closing the other eye.
D. Start with the bottom line of the Snellen chart and work upward. The patient should start from the top of the Snellen chart and work downward. Starting from the bottom would likely result in frustration and inaccurate assessment as the lines become increasingly difficult.

A. Wash visibly-soiled hands for a minimum of 10 seconds with warm water. Hand hygiene guidelines recommend washing visibly soiled hands for at least 20 seconds, not 10 seconds, with soap and water.
B. Use alcohol-based hand sanitizers that contain 50% alcohol. Alcohol-based hand sanitizers should contain at least 60-70% alcohol to be effective in killing most pathogens.
C. Keep natural nail tips no longer than 1/4 inch. Keeping natural nail tips no longer than 1/4 inch helps prevent the accumulation of pathogens and is recommended by hand hygiene guidelines.
D. Clean artificial nails with an orange stick. Artificial nails are not recommended in healthcare settings because they can harbor pathogens and are difficult to clean effectively.