The conjunctival staining ring seen after lens removal is called what?

The conjunctival staining ring seen after lens removal is called what?

• A. Epithelial Defect
• B. Subconjunctival hemorrhage
• C. Impression Ring
• D. Corneal ulcer

Answer: (C)

The important idea is that an impression ring is a ring-like conjunctival staining pattern seen after removing a contact lens. It occurs because the edge of the lens briefly pressed on the bulbar conjunctiva during wear, leaving a temporary imprint on the conjunctival surface. When fluorescein is used to examine the eye, this imprint appears as a distinct circular staining line around the limbus—an “impression” of the lens edge. This is different from epithelial damage on the cornea, which would show corneal staining rather than a conjunctival ring. It also isn’t a subconjunctival hemorrhage, which would present as a red patch, or a corneal ulcer, which would involve the cornea with epithelial loss and often symptoms like pain and discharge. If you see an impression ring, it suggests the lens edge may be too tight or causing mechanical rubbing, so evaluating and adjusting the lens fit—particularly the peripheral edge geometry and clearance—can improve comfort and reduce staining.

The important idea is that an impression ring is a ring-like conjunctival staining pattern seen after removing a contact lens. It occurs because the edge of the lens briefly pressed on the bulbar conjunctiva during wear, leaving a temporary imprint on the conjunctival surface. When fluorescein is used to examine the eye, this imprint appears as a distinct circular staining line around the limbus—an “impression” of the lens edge.

This is different from epithelial damage on the cornea, which would show corneal staining rather than a conjunctival ring. It also isn’t a subconjunctival hemorrhage, which would present as a red patch, or a corneal ulcer, which would involve the cornea with epithelial loss and often symptoms like pain and discharge.

If you see an impression ring, it suggests the lens edge may be too tight or causing mechanical rubbing, so evaluating and adjusting the lens fit—particularly the peripheral edge geometry and clearance—can improve comfort and reduce staining.