As an expert in the field of ophthalmology, I can provide you with a comprehensive understanding of the causes behind the feeling of sand in your eyes. This sensation is often referred to as a foreign body sensation and can be quite discomforting. There are several reasons why one might experience this feeling, and I will outline them below.

Dry Eye Syndrome: As you've mentioned, dry eye syndrome is indeed one of the most common causes of a gritty feeling in the eyes. This condition arises when the eyes do not produce enough tears, or the tears evaporate too quickly, leading to a lack of lubrication on the surface of the eyes. The symptoms can include a sandy, gritty sensation, redness, itching, and even pain. The sensation tends to worsen as the day progresses due to increased exposure to environmental factors like wind, air conditioning, and prolonged screen time.

Allergies: Allergic reactions can also lead to a gritty feeling in the eyes. When the eyes are exposed to allergens like pollen, dust, or pet dander, the immune system may respond by producing excess tears and inflammation. This can result in the sensation of having sand in the eyes, along with other symptoms like redness, tearing, and swelling.

Eye Injuries: Trauma to the eye, such as from a scratch, a foreign object, or a chemical burn, can cause a gritty feeling. The injury can irritate the cornea or conjunctiva, leading to discomfort and a sensation akin to having sand in the eyes.

Infections: Certain eye infections, such as conjunctivitis (also known as pink eye), can cause a gritty sensation. The inflammation and discharge associated with the infection can make the eyes feel gritty and uncomfortable.

Contact Lens Use: Prolonged or improper use of contact lenses can lead to a gritty feeling. This can be due to the lenses becoming dirty, the eyes not receiving enough oxygen, or an allergic reaction to the lens material or the solution used to clean them.

Environmental Irritants: Exposure to environmental irritants like smoke, dust, or air pollution can cause the eyes to feel gritty. These irritants can dry out the eyes or cause irritation, leading to the sensation of sand.

Debris or Foreign Objects: Sometimes, the feeling of sand in the eyes can be due to actual tiny particles of debris or foreign objects that have become lodged in the eye. This can happen during activities like gardening, working with machinery, or even just spending time outdoors in a windy environment.

Chronic Conditions: Certain chronic conditions, such as blepharitis (inflammation of the eyelids), can lead to a gritty feeling in the eyes. The condition can cause the eyelids to produce crusty debris that can fall into the eyes, leading to discomfort.

It is crucial to consult with an eye care professional if you experience a persistent gritty feeling in your eyes. An eye doctor can diagnose the underlying cause and recommend appropriate treatment, which may include lubricating eye drops, allergy medication, or in more severe cases, prescription eye drops or even surgery.

Now, let's proceed with the translation into Chinese.

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Dry eye syndrome is the most common cause of a gritty feeling in your eyes. Dry eye syndrome often causes a sandy, gritty sensation in the morning that usually gets worse throughout the day. ... It is important to see your eye doctor because sometimes eye drops are not enough.Mar 30, 2018read more >>