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An iris sphincter tear is a break in the circular muscle that constricts the pupil. It typically follows blunt injury but can also occur during surgery. The pupil may appear irregular and react poorly to light. People may notice glare or difficulty adjusting to brightness. Exams help determine the tear's size and effect on focusing.
read more about iris sphincter tear ...Trauma is the most common cause. Surgical instruments can tear the sphincter in complicated cases. Rapid pressure changes may also stretch and damage the muscle. Inflammation rarely contributes. Understanding the cause guides care.
The pupil may look oval or notched. Light sensitivity increases because the pupil cannot constrict fully. People may notice glare or difficulty shifting from bright to dim areas. Depth of focus may change slightly. Symptoms depend on tear size.
Doctors use slit lamp exam to study muscle continuity. Pupil testing shows sluggish or incomplete constriction. Imaging helps evaluate deeper injury if trauma was significant. History clarifies the timing and trigger. Diagnosis guides repair decisions.
Mild tears may not need treatment. Surgery can repair the muscle for better symmetry and function. Tinted lenses help reduce glare. Management also focuses on any additional trauma-related issues. Follow-up checks for long-term stability.
Not completely, but small tears may function well enough.
Mostly through increased glare.
Only when function or appearance is significantly affected.
Seek care after eye trauma or if the pupil becomes irregular.