Diagnosing Conjunctivitis (Pink Eye)
Conjunctivitis refers to inflammation and redness of the conjunctiva, which is the transparent membrane that lines the front of the eye and eyelids. It is called “pink eye” because conjunctivitis may cause the white of the eye to look pink or red. Conjunctivitis can be caused by various factors, including viral or bacterial infections, allergies, and irritants like smoke or fumes.
To diagnose conjunctivitis, doctors may perform several examinations, screening tests, and procedures. These help confirm the diagnosis and determine the type of conjunctivitis. Specialists who may be involved in diagnosing conjunctivitis include ophthalmologists and optometrists.
Here are some common examinations, tests, and procedures used for diagnosing conjunctivitis:
- Visual assessment: Doctors visually assess a person's symptoms by examining the eyes for redness, swelling, discharge, or other signs of inflammation.
- Patient history: Doctors ask about a person's eye health history and whether they have associated symptoms. This helps identify any underlying causes or factors contributing to the condition.
- Physical examination: Doctors conduct a physical examination of the eyes using bright light and magnification. This allows them to examine the conjunctiva (the clear tissue covering the white part of the eye) and other eye structures for abnormalities or foreign substances that may be causing eye irritation.
- Fluorescein eye stain: In some cases, doctors may use fluorescein eye stain to identify specific causes of conjunctivitis. This test involves applying a nontoxic dye to the eye's surface and using UV light to look for abnormalities on the cornea (the clear front surface of the eye). For example, it can help identify herpes simplex virus (HSV) if there is a history of cold sores or skin lesions.
- Conjunctival tissue scrapings: In severe or chronic cases of conjunctivitis, doctors may collect conjunctival tissue scrapings for further analysis. This can help identify any specific pathogens or underlying conditions that may be causing the conjunctivitis.
- Lab tests: Doctors may take cultures or smears of conjunctival tissue or eye discharge to identify the specific pathogen causing the conjunctivitis. This is particularly useful if the condition does not resolve with treatment.
Other examinations or tests may be performed based upon initial findings or other individualized factors. An accurate diagnosis is important to determine an appropriate treatment plan.