DIURNAL CURVE
A Diurnal Curve is a structured intraocular pressure monitoring service that measures eye pressure at several time points within the same day. Instead of relying on a single reading, this test tracks pressure changes across hours. As a result, your ophthalmologist can detect hidden pressure spikes and daily fluctuations that may affect glaucoma diagnosis and management.
WHAT THIS SERVICE DOES
Eye pressure naturally rises and falls during the day. However, a single clinic measurement may miss important peaks. A Diurnal Curve records multiple readings at scheduled intervals. Therefore, it provides a more complete pressure profile. Doctors use this pattern to refine diagnosis, assess treatment response, and adjust medications when needed.
WHEN DOCTORS REQUEST A DIURNAL CURVE
This service is recommended when pressure behavior needs closer study. For example, it supports decision-making in complex or borderline cases.
1. Suspected glaucoma with normal single readings
2. Known glaucoma under treatment review
3. Ocular hypertension monitoring
4. Unexplained optic nerve changes
5. Variable prior pressure measurements
HOW THE TEST IS PERFORMED
The clinic measures intraocular pressure several times during the day using standard tonometry. First, a baseline reading is taken. Next, repeat measurements occur at planned intervals. Each measurement takes only a short time. Consequently, the process remains practical and organized. The same calibrated device and technique are used for consistency.
Depending on the plan, visits may span morning to late afternoon. Your doctor will provide the exact schedule in advance.
PATIENT EXPERIENCE AND SAFETY
Pressure measurement is quick and generally well tolerated. In most cases, anesthetic drops are applied before contact tonometry. Because the contact is brief, discomfort is minimal. Moreover, patients can rest between readings. Normal activities may continue between scheduled measurements unless otherwise advised.
WHY DAILY PRESSURE PATTERNS MATTER
Glaucoma risk relates not only to average pressure but also to fluctuation and peak levels. For instance, some patients show normal readings during routine visits yet develop high spikes at other times. Therefore, a Diurnal Curve helps reveal the true pressure range and supports safer, more personalized care.