Understanding the causes of ptosis, or the weakening of the eyelid muscles, is crucial for accurate diagnosis and effective therapy. One or both eyelids may have ptosis, which results in a drooping look that may partially or fully hide the eye. 

The following are some of the causes that may contribute to eyelid muscle weakness, (กล้ามเนื้อหนังตาอ่อนแรง, which is the term in Thai). 


The aging process is one of the most typical reasons of weak eyelid muscles. Ptosis can result from weakening eyelid-controlling muscles over time. Changes in muscle tone and tissue flexibility are frequently to blame for this aging-related ptosis.

Neurological Disorders

The nerves that govern the muscles of the eyelids may be impacted by specific neurological diseases. Eyelid muscle weakness and drooping can be caused by illnesses including myasthenia gravis, a neuromuscular ailment, and third nerve palsy, which affect the oculomotor nerve. 

Injury Or Trauma

Weakness in the eyelid muscles can result from physical trauma or damage to the eye or the muscles around it. This might happen as a consequence of a direct hit or damage to the nerves that control the eyelid muscles.

Congenital Elements

Some people have congenital ptosis, which means their eyelid muscles are weak from birth. Genetic causes or improper growth of the muscles and nerves involved for eyelid movement may be to blame for this disorder.  

Complications Of Eye Surgery

Ptosis can be a side effect of eye procedures like LASIK or cataract surgery. This might happen as a result of the surgery harming the muscles or nerves.

Inflammatory Diseases

Weakness in the eyelid muscles can be caused by inflammatory disorders that affect the eyelid or nearby tissues, such as blepharitis or orbital cellulitis. These issues may cause tissue inflammation, which in turn may cause muscular dysfunction. 


Ptosis may occur in rare instances when eyelid tumors or growths strain on the muscles or nerves necessary for eyelid mobility. In the event that a tumor is suspected, quick assessment and treatment are crucial.

Use Of Contact Lenses

Contact lens misuse, such as wearing them for long periods of time or not cleaning and caring for them properly, can cause eye irritation and pain. The weakening of the eyelid muscles may be indirectly caused by this. 

The Conclusion

It’s critical to speak with an ophthalmologist or other healthcare provider if you detect recurrent drooping of the eyelids or muscular weakness. They are capable of doing a complete assessment, determining the underlying reason, and recommending the best course of action, which in certain circumstances may entail surgical repair. Early detection and treatment can reduce symptoms, enhance visual function, and enhance outward appearance.