An acute angle is less than 90 ... There are 360° in a full turn. The hour hand of a clock make a full 360° turn for each hour of the day. You can use a tool called a protractor to measure ...

About one spot per clock hour is sufficient and in most cases ... However, the pupil may remain irregular after an acute angle-closure attack itself due to ischemic damage to the iris sphincter.

Documented evidence for previous acute angle closure attack was ... The whole circumference of the drainage angle was divided into 12 clock hours of smaller segments, each extending over 30 ...