This study uses a gamma camera to follow the passage of a drop of radio-labelled fluid
(usually Technetium 99) from the conjunctival sac to the nasal passages, and provides a measure of physiological tear clearance where there is a patent system on clinical
examination or dacryocystography (Figure 10.19). In this situation, scintigraphy will generally reveal whether there is a failure of gathering of tears into the drainage system (often due to lid anomalies), or a failure of clearance of tears that are otherwise rapidly entering the system from the tear lake.
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