Usually caused by a bacterial infection, styes appear like a pimple on the outside or inside of the eyelid. They are fairly common and most resolve without treatment within a few days or weeks. A warm compress may be used to encourage the stye to release pus and heal more quickly.

In blepharitis, the rims of the eyelids become inflamed, red and swollen. It can develop at any time but is more likely in people over the age of 40. It can be caused by a bacterial infection or be a complication of another condition, such as seborrheic dermatitis or rosacea. Symptoms include itchy, sore eyelids, crusty eyelashes and eyelids that stick together upon waking. 

Blepharitis is not usually serious, but it is usually a long-term, chronic condition, which means once it develops it can cause repeated episodes. There is no cure but establishing a daily eye-cleaning routine may help to control symptoms.

Dry eye syndrome tends to occur when insufficient tears are produced or when the tears that are made don’t have the correct consistency and so evaporate too quickly. It is more common in older people and in women. 

Symptoms include:

• Redness 
• Stinging or a burning sensation
• A gritty, irritated feeling
• Temporary blurred vision
• Decreased tolerance for reading or working on a computer.

Possible causes include:

• Hormonal changes (e.g., menopause, pregnancy)
• Certain medicines (e.g., antidepressants or blood pressure medicines)
• Wearing contact lenses 
• Recent laser eye surgery
• Environmental factors (e.g., low humidity, wind, high altitude, exposure to smoke, high pollen levels)
• Prolonged reading or use of a computer
• Other health conditions (e.g., rheumatoid arthritis, diabetes, allergies, blepharitis).

There is no cure for dry eye syndrome, and some people may suffer from recurring episodes throughout their lives. However, over-the-counter (OTC) treatments, coupled with relevant lifestyle changes, can relieve symptoms.