Identify staining related to contact lenses.

Identification should include

• staining related to contact lens fit (e.g., arcuate staining, 3 & 9 o’clock staining)
• staining related to physiological complications (e.g., diffuse stippling, foreign body).

Process/Skill Questions:

• What causes staining?
• What are the differences between the two types of staining? What are the similarities?
• What is needed to view a stain?