What ptosis actually is
Ptosis is a drooping of the upper eyelid caused by weakness or stretching of the levator muscle - the muscle that lifts the lid. It's a mechanical, muscular issue, distinct from the loose, crepey eyelid skin that also becomes more common with age. The two frequently occur together, which is part of why ptosis is so often mistaken for a purely cosmetic ageing change.
Why it develops in adulthood
The most common cause in adults is involutional ptosis - a gradual stretching or thinning of the tendon that attaches the levator muscle to the eyelid, which becomes more likely with age. Other contributors include long-term contact lens wear, previous eye surgery (including cataract surgery), eye rubbing, and certain neurological or muscular conditions, though these are less common. Because the underlying cause affects how ptosis is best treated, identifying it is a key part of assessment.
Beyond appearance: function and comfort
A drooping lid does more than change how the eye looks. Many patients unconsciously raise their eyebrows or tilt their head back to compensate, which over time can contribute to brow ache, forehead tension and even neck strain. In more pronounced cases, the lid can encroach on the upper visual field, particularly noticeable when reading, driving, or in peripheral awareness.
Patients are often surprised how much easier their eyes feel after ptosis repair - not just how much better they look.
How it's assessed
Assessment measures the height of the eyelid margin relative to the pupil, the strength and range of movement of the levator muscle, and how the eyelid position changes with gaze direction. This helps distinguish straightforward involutional ptosis from cases needing a different surgical approach, and identifies whether eyelid skin excess is also contributing to the overall appearance.
What treatment involves
Surgical correction typically shortens or tightens the levator muscle to restore a more natural, symmetrical eyelid height. Depending on findings, this can be approached from behind the eyelid with no visible external scar, or through a fine incision hidden in the natural upper-lid crease - and can be combined with blepharoplasty where eyelid skin is also a factor.
If one or both of your eyelids sit noticeably lower than they used to, or you find yourself unconsciously lifting your brows to see clearly, it's worth having the underlying cause properly assessed rather than assuming it's simply cosmetic ageing.