Professional attendance of more than 15 minutes in duration, being the first in a course of attention if the patient has attended another optometrist for an attendance to which this item or item 10905, 10910, 10911, 10913, 10914 or 10915 applies: (a) for a patient who is less than 65 years of age-within the previous 36 months; or (b) for a patient who is at least 65 years or age-within the previous 12 months