Ptosis surgery is a procedure that raises a drooping upper eyelid by tightening or reattaching the muscles responsible for lifting it. The surgery can restore blocked vision, reduce forehead strain from constantly raising the brow, and improve facial symmetry. It’s one of the most common eyelid procedures performed by oculoplastic surgeons, and the specific technique used depends on how much your eyelid droops and how well the lifting muscle still works.
Why the Eyelid Droops
Your upper eyelid is held open primarily by a thin muscle called the levator, with a smaller helper muscle sitting just behind it. In most adults, ptosis develops when the levator’s tendon stretches or detaches from the eyelid over time, a process accelerated by aging, contact lens wear, or previous eye surgeries. The eyelid gradually sinks lower across the pupil, narrowing your field of vision from above.
Children can be born with ptosis if the levator muscle didn’t develop properly. In rarer cases, ptosis results from nerve damage, neurological conditions like myasthenia gravis, or trauma to the eye area. The underlying cause matters because it determines which surgical approach will work best.
When Surgery Becomes Medically Necessary
Ptosis surgery is performed for both functional and cosmetic reasons. Insurance coverage typically requires proof that the drooping eyelid blocks your vision. The standard test is an automated visual field exam: you look into a machine that maps where you can and can’t see. To qualify, you generally need to show at least 12 degrees of lost vision in your upper visual field, and taping the eyelid up must improve the number of points you can see by 30% or more. These results are paired with photographs documenting the droop.
If your ptosis is mild and doesn’t affect vision, the surgery is considered cosmetic and typically paid out of pocket.
The Pre-Surgery Eye Drop Test
Before choosing a technique, your surgeon will likely place a drop of a stimulant medication in your eye and watch what happens to your eyelid over the next five minutes. This “phenylephrine test” causes a small helper muscle in the eyelid to contract, temporarily lifting the lid. The majority of drooping eyelids respond to this test regardless of how well the main levator muscle works.
If your eyelid lifts nicely with the drop, it signals that a less invasive, internal approach will likely succeed. If the eyelid barely moves, the surgeon knows a more involved external repair is needed. This simple test is one of the most useful predictors of which surgery will give you the best result.
Three Main Surgical Techniques
Internal (Posterior) Approach
This technique works from the inside of the eyelid, removing a small strip of the helper muscle and the tissue lining the inner lid. It’s best suited for mild to moderate ptosis when the levator muscle still functions well and the phenylephrine test shows a good response. Because the incision is behind the eyelid, there’s no visible scar. It also leaves the structural plate of the eyelid and its oil glands intact, which can matter if you ever need additional eyelid procedures in the future.
The main limitation is that it can’t fix excess skin. If you also have loose, heavy skin on your upper lids, your surgeon may need to combine this approach with a separate skin-removal procedure. The internal approach also generally requires deeper sedation or general anesthesia, since operating on the inside of an awake patient’s eyelid is more uncomfortable.
External Levator Repair
This is the most commonly performed ptosis surgery. The surgeon makes an incision in the natural crease of your upper eyelid, finds the levator muscle’s stretched tendon, and reattaches or shortens it. Because you’re approached from the front, the surgeon can also remove excess skin during the same operation if needed.
External repair works across a wider range of ptosis severity and gives the surgeon the ability to adjust eyelid height during the procedure. It does leave a scar, but it’s hidden in the eyelid crease and typically becomes nearly invisible. This technique is usually done under local anesthesia with light sedation, meaning you’re awake but comfortable. Being awake actually helps: the surgeon can ask you to open your eyes during the procedure to check the lid position in real time.
Frontalis Sling
When the levator muscle is very weak or absent (typically 2 to 6 millimeters of movement or less), neither of the standard repairs will work. Instead, the surgeon connects the eyelid to the forehead muscle using a sling material, so that raising your eyebrows also lifts the lid.
The gold standard sling material is a strip of tissue harvested from your own thigh, which can be done in patients older than about three to five years. When that isn’t an option, surgeons use synthetic alternatives like silicone rods or specialized suture material. This technique is most often used for children born with severe ptosis and for adults with ptosis caused by conditions like progressive nerve or muscle disease.
Success Rates and Revision Risk
Ptosis surgery has a strong track record but isn’t always perfect on the first attempt. In published surgical series, around 83% of patients achieve a good result after the initial procedure. The most common issue is undercorrection, where the lid is higher than before but still not quite where it should be. Overcorrection, where the lid sits too high, is less frequent but does occur.
When a second procedure is performed to fine-tune the result, success rates climb to roughly 92%. Your surgeon will want to wait several months between operations to allow full healing before deciding whether a revision is worthwhile. Minor asymmetry between the two eyes is common during the healing period and doesn’t always mean a second surgery is needed.
What Recovery Looks Like
For the first 48 hours, the focus is on controlling swelling. You’ll apply ice packs or saline-soaked cold gauze to the eyelids frequently during this window, as this is when swelling peaks. If you have external incisions, you’ll clean them twice a day with saline and apply an ophthalmic ointment for about a week.
Physical activity is limited for the first week: no heavy lifting (nothing heavier than a couple of bags of groceries), no bending over, and no straining. If you need to sneeze, open your mouth to reduce pressure around the eyes. Most people look presentable within one to two weeks, though bruising and residual puffiness can linger.
The eyelid position will shift noticeably during healing. Swelling can push the lid higher or lower than its intended final position, which can be unsettling if you’re checking the mirror daily. The lid typically settles into its final position two to three months after surgery. Your surgeon will evaluate the result at the three-month mark and compare it to your other eyelid before discussing whether any adjustment is needed. Monthly follow-up visits are standard throughout this period.
The Risk of Incomplete Eye Closure
The most important risk specific to ptosis surgery is lagophthalmos, which means you can’t fully close your eyelid after the procedure. This happens because lifting the lid higher changes the mechanics of blinking. Some degree of incomplete closure is common in the first days or weeks and usually improves as swelling goes down and the tissues relax.
If it persists, it causes dryness, irritation, and a gritty sensation because the eye’s surface isn’t being properly protected. Mild cases are managed with artificial tears during the day and lubricating ointment at night. Taping the eyelid shut while you sleep or wearing moisture-retaining goggles can also help. In rare cases where lagophthalmos is severe and permanent, surgical correction is possible, including procedures that place tiny gold or platinum weights inside the eyelid to help gravity pull it closed.
Your surgeon will assess your risk for this complication before the procedure. People with dry eyes, prior eyelid surgery, or weak blink reflexes are more vulnerable and may need a more conservative correction to balance lid height against the ability to close comfortably.