|Level of protection||Protective measures||Applicable object|
|Primary protection||Cap, surgical mask, and working clothes (with/without gown)||Indirect contact with patients, usher, non-operative inquiry and ward rounds.|
|Secondary protection||Cap, surgical mask/N95 mask, working clothes with gown, protective goggles/face shield, and disposable gloves||Direct contact with patients such as slit lamp, gonioscopy, ultrasound and other specialized examinations; puncture, injection, outpatient laser and other professional operations.|
|Tertiary protection||Cap, N95 mask, protective clothing with gown, protective goggles, face shield, and two pairs of disposable gloves||Contact with blood, body fluids, secretions and other spillages; specimen collection that may produce eye aerosols; internal eye surgery etc.|
The anesthesiologist should also adhere to this level of protection during general anesthesia operations.