Severe itchiness can be uncomfortable and disrupt reading, vision, and eye focus. Here are some common causes.

Vernal keratoconjunctivitis (VKC) is an inflammation of the membrane covering the front of the eye. This condition often affects children, with symptoms including hard, raised, cobblestone-like bumps on the upper eyelids. VKC is often seasonal, but some experience it year-round. Severe cases can lead to corneal ulcers and scarring.

Allergic conjunctivitis occurs when the inner membrane covering the eye reacts to external agents like pollen, mold, weeds, pet dander, and dust mites. Cosmetics, skin creams, contact lens solutions, or other irritants around the eyes can also cause itching and allergic reactions.

Computer vision syndrome (CVS), also known as digital eye strain, results from prolonged use of computers or other digital devices. Normally, people blink 18-22 times per minute to keep their eyes lubricated. However, this rate can drop to 3-7 times per minute when using electronic devices. This strains the eyes, leading to CVS symptoms like watery eyes, dryness, itching, redness, blurred or double vision, and light sensitivity.

Dry eye syndrome occurs when the eyes don't produce enough tears or the tears evaporate too quickly. The lack of lubrication and moisture irritates the eye's surface, causing itching and discomfort. Vitamin A and omega-3 fatty acid deficiencies can increase the risk of dry eyes. Symptoms may include a gritty sensation, burning, stinging, and increased sensitivity to dust or airborne particles.

Meibomian gland dysfunction (MGD) affects the oil glands in the upper and lower eyelids. When these glands become blocked or dysfunctional, tears lack the necessary oil to maintain moisture, leading to itchiness.

Contact lens-induced conjunctivitis can affect contact lens wearers due to improper hygiene. Besides itching, infections can sometimes damage the cornea and cause scarring.

Giant papillary conjunctivitis (GPC) is often linked to allergic reactions and can manifest as large bumps under the eyelids. Allergic conjunctivitis, contact lens use, overuse of artificial tears, and infectious conjunctivitis can all cause GPC.

Bao Bao (Theo Health, Medical News Today)