Why does conjunctivitis cause light sensitivity?

Light Sensitivity is a common presentation of Conjunctivitis. The symptom may feel like a need to squint, blink more often, or seek a dimmer room.

The conjunctiva covers the white of the eye and lines the eyelids. When it is inflamed, blinking and exposure to air or light can be more noticeable. Tears may also become excessive, blurring vision briefly until they are wiped away. Itching often points toward an allergic trigger, while discharge or cold-like symptoms may accompany an infectious cause, but a clinician considers the full picture.

Rest the eyes from bright screens where possible and use gentle indoor lighting or sunglasses outdoors for comfort. Do not rub the eye, because rubbing can aggravate irritation and transfer germs. Wash hands regularly, avoid sharing face cloths and cosmetics, and stop wearing contact lenses while the eye is inflamed. Follow any prescribed drops exactly as instructed.

Strong or increasing sensitivity to light deserves prompt medical assessment, especially with eye pain, a change in vision, severe headache, nausea, injury, or a chemical exposure. Seek urgent help if the eye looks cloudy, the pupil appears unusual, or you cannot comfortably keep the eye open. These features can occur with problems beyond uncomplicated conjunctivitis.

Ask what is likely irritating the eye and whether an examination of the cornea is needed. Tell the clinician about contact lenses, recent illness, new eye products, one-sided symptoms, pain, vision changes, and how bright light affects daily activities.