The complicated one states that an audit is 'The systematic and critical analysis of the quality of clinical care, including the procedures used for diagnosis, treatment, and provision of care, the associated use of resources, and the resulting outcome and quality of life for the patient.” 

and the simple one:
“Are we doing what we do in the best way we can?” 

All ophthalmologists should be monitoring and improving the quality of care they provide. Therefore, the ability to carry out an audit is therefore a skill of minimal competence for a trainee ophthalmologist. 

The 7 easy steps for an audit are:

Step 1: Pick a topic

Step 2: Define and plan the audit

Step 3: Develop criteria/standards

Step 4: Analyse and interpret data

Step 5: Measure clinical practice against agreed standard

Step 6: Effect change

Step 7: Close audit cycle