Dryness, irritation and fluctuating vision can occur after SMILE eye surgery, particularly during the early healing period. For most patients, these symptoms improve gradually as the corneal nerves and tear film recover.
SMILE generally causes less disruption to the corneal nerves than LASIK because it uses a small incision rather than creating a large corneal flap. This may reduce the impact on the ocular surface, but it does not eliminate the possibility of dry eye.
How long symptoms last varies from person to person. Some patients notice improvement within the first few weeks, while others may experience dryness or fluctuating vision for several months.
If you are considering SMILE or are already recovering from the procedure, the SMILE Eye Surgery guide provides a broader overview of the treatment.
Why Can SMILE Cause Dry Eyes?
The cornea contains a dense network of nerves that plays an important role in detecting sensation and helping regulate the tear film.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
During SMILE, some of these nerves are affected as the surgeon creates the lenticule and accesses it through the small corneal incision. This can temporarily alter corneal sensation and the normal feedback mechanisms involved in tear production and blinking. The result can be a period of ocular-surface instability after surgery.
Symptoms may include:
- Dryness or a gritty sensation
- Burning or mild irritation
- A feeling that something is in the eye
- Redness or watering
- Light sensitivity
- Fluctuating vision
- Temporary discomfort, particularly during prolonged screen use
These symptoms do not necessarily mean that the surgery has gone wrong. They can occur as part of the normal healing process.
How Long Does Dry Eye Last After SMILE?
There is no single recovery time that applies to everyone. For many patients, dryness is most noticeable during the first few weeks and gradually becomes less bothersome over the following weeks and months.
Studies of SMILE have generally found that dry-eye signs and symptoms worsen temporarily after surgery and then improve with time. Research comparing SMILE with LASIK also suggests that SMILE tends to have a smaller effect on corneal sensitivity and several measures of tear-film function.
By around 3 to 6 months, many patients have experienced substantial improvement in ocular-surface symptoms. However, recovery is not identical for everyone, and a smaller group may continue to experience symptoms for longer.
Current evidence therefore supports thinking of postoperative dry eye as a gradual recovery process rather than a fixed-duration side effect.
Dry Eye After SMILE: A General Recovery Pattern
| Time after surgery | What you may notice |
|---|---|
| First few days | Dryness, irritation, watering, light sensitivity or fluctuating vision may be noticeable. |
| First 2–4 weeks | Dryness may continue, especially during prolonged screen use or in air-conditioned environments. |
| 1–3 months | Symptoms often begin settling as the ocular surface and corneal sensation recover. |
| 3–6 months | Many patients experience substantial improvement, although some symptoms may persist. |
| Beyond 6 months | Persistent or significant dryness should be discussed with an ophthalmologist rather than assumed to be part of normal healing. |
This timeline is a general guide, not a prediction of how your eyes will heal. Some people recover sooner, while others require longer ocular-surface management.
Why Does Vision Fluctuate When the Eyes Are Dry?
Dry eye can affect vision as well as comfort. The tear film forms a smooth optical layer over the cornea. When the tear film becomes unstable, the optical surface can temporarily become irregular.
This can cause vision to appear clear one moment and slightly blurry the next, particularly during activities that reduce blinking. You may notice this more when:
- Reading for a long time
- Using a computer or phone
- Driving for extended periods
- Working in air conditioning
- Spending time in a dry or windy environment
Vision that fluctuates with blinking can sometimes be associated with tear-film instability. However, persistent or worsening visual changes should always be assessed during follow-up.
Why Does SMILE Usually Cause Less Dry Eye Than LASIK?
SMILE and LASIK both affect corneal nerves, but the pattern of nerve disruption is different. LASIK requires creation of a corneal flap, which involves cutting through a larger area of the corneal nerve network. SMILE uses a much smaller incision and preserves more of the anterior corneal tissue and nerve architecture.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Comparative research has found better preservation of corneal sensitivity and several tear-film measures after SMILE compared with femtosecond LASIK.
A 2025 systematic review and meta-analysis found better tear-breakup time and corneal-sensitivity outcomes after lenticule extraction at several postoperative time points, although differences in patient-reported dry-eye symptoms were not consistently significant.
This is an important distinction: SMILE may reduce the impact on the ocular surface compared with LASIK, but it does not make dry eye impossible.
Who Is More Likely to Experience Longer-Lasting Dryness?
Some people have a higher risk of postoperative dry-eye symptoms than others. Risk may be influenced by:
- Dry eye that existed before surgery
- Meibomian gland dysfunction
- Ocular-surface inflammation
- Contact-lens-related ocular-surface problems
- Long periods of screen use
- Environmental dryness, wind or air conditioning
- Individual differences in corneal nerve recovery
- Certain systemic conditions or medications
This is why a thorough assessment of the ocular surface before SMILE is important. Treating significant dry eye before surgery can help improve the condition of the eye surface and make measurements more reliable.
What Can You Do to Relieve Dry Eyes After SMILE?
Postoperative treatment should follow the plan provided by your ophthalmologist. Depending on your symptoms, your doctor may recommend lubricating eye drops or other treatments aimed at improving the tear film and ocular surface.
Some simple measures can also reduce everyday irritation:
- Take regular breaks during prolonged screen use.
- Remember to blink fully and regularly when concentrating on a screen.
- Avoid direct airflow from fans or air conditioners toward your eyes.
- Protect your eyes from excessive wind and dust.
- Stay adequately hydrated.
- Follow the prescribed postoperative eye-drop schedule.
- Attend scheduled follow-up examinations.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
If symptoms remain significant, your ophthalmologist may look for specific causes such as tear deficiency, meibomian gland dysfunction or ocular-surface inflammation and adjust treatment accordingly.
Can Dry Eye Affect the Final Vision After SMILE?
It can temporarily affect the quality and consistency of vision. An unstable tear film can cause fluctuating visual clarity even when the underlying refractive correction is satisfactory.
This is one reason that visual results should not always be judged during the earliest days or weeks after surgery. As the ocular surface stabilizes, vision may become more consistent.
If visual quality remains poor after the expected healing period, however, your surgeon may investigate other causes rather than attributing everything to dry eye.
Does Screen Time Make Dry Eye Worse After SMILE?
It can. When people concentrate on a screen, they tend to blink less frequently and may not close their eyelids completely with each blink. This can increase tear evaporation and make dryness more noticeable.
During early recovery, taking regular breaks and consciously blinking can make screen use more comfortable. If your work requires prolonged computer use, discuss any persistent symptoms with your ophthalmologist rather than simply increasing the use of eye drops on your own.
Will Dry Eyes Affect Both Eyes Equally?
Not necessarily. Although both eyes are usually treated during SMILE, postoperative symptoms can differ between them. Differences in corneal healing, tear-film stability and pre-existing ocular-surface health can contribute to unequal symptoms.
A difference between the two eyes does not automatically indicate a complication, but a significant or worsening difference should be reported during follow-up.
The Bottom Line
Dry eyes after SMILE are usually a temporary part of the healing process. Symptoms are often most noticeable during the first few weeks and tend to improve gradually as the corneal nerves and tear film recover. Many patients experience substantial improvement within 3–6 months.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
SMILE generally has a smaller effect on corneal nerves and several measures of ocular-surface function than LASIK, but it does not eliminate the possibility of postoperative dry eye.
Existing dry eye, ocular-surface problems, prolonged screen use and individual differences in healing can influence how long symptoms last. Following postoperative instructions, using prescribed lubricants and protecting the eyes from drying environments can make recovery more comfortable.
If dryness is severe, persistent or getting worse rather than gradually improving, it should be assessed rather than simply attributed to normal recovery. In most cases, the goal is not just to wait for symptoms to disappear but to identify and treat anything that may be prolonging ocular-surface irritation.
