Note on surgical correction of presbyopia
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"Presbyopia"[MeSH Terms] AND surgery
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presbyopia surgical correction review corneal inlays multifocal IOL refractive lens exchange professional ophthalmology
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https://pmc.ncbi.nlm.nih.gov/articles/PMC12326228/
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PMID: 40226888
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PMID: 38627651
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Surgical correction of presbyopia
Presbyopia is the age-related decline in accommodation that reduces near vision. Surgery does not restore the youthful natural lens in most cases. Instead, it increases depth of focus, creates monovision, or replaces the crystalline lens with an intraocular lens (IOL) that distributes focus across distances.
Surgery is elective and should follow a full ocular assessment and clear discussion of trade-offs. Spectacles and contact lenses remain the safest options.
1. Corneal procedures
A. Laser monovision
LASIK, PRK, or SMILE-type corneal refractive correction is used to target:
- Dominant eye for distance vision
- Non-dominant eye for near or intermediate vision
This is usually the most established corneal strategy. A preoperative monovision contact-lens trial is advisable to confirm tolerance.
Advantages
- Does not involve intraocular surgery
- Can correct coexisting myopia, hyperopia, and astigmatism
- Often reduces dependence on reading glasses
Limitations and risks
- Reduced stereopsis and binocular contrast sensitivity
- Night-driving difficulty, glare, dry eye, residual refractive error
- Not everyone adapts to unequal focus between eyes
- Presbyopia progresses, so the near target may need adjustment with time
The AAO similarly advises trying monovision contact lenses before permanent laser monovision surgery, as described in its presbyopia treatment guidance.
B. PresbyLASIK or multifocal corneal ablation
Laser ablation changes corneal asphericity to create a multifocal or extended-depth-of-focus corneal profile.
Potential benefit: Simultaneous distance, intermediate, and near vision.
Drawbacks: Variable visual quality, reduced contrast, glare and halos, and uncertain advantage over standard monovision ablation. Kanski notes that the benefit over monofocal ablation remains unclear. Kanski's Clinical Ophthalmology: A Systematic Approach, 10th ed., p. 300.
C. Corneal inlays
A small implant may be placed in a stromal pocket or beneath a flap, commonly in the non-dominant eye. Designs include:
- Small-aperture inlays, using a pinhole effect
- Refractive inlays
- Corneal-reshaping inlays
Potentially, these improve near vision while preserving useful distance vision. However, their use has declined in many settings because of variable outcomes and complications.
Complications
- Corneal haze or stromal scarring
- Dry eye
- Decentration
- Keratolysis, vascularization, opacification, epithelial ingrowth
- Glare, halos, reduced contrast sensitivity, dim-light reading problems
- Need for explantation
Kanski's Clinical Ophthalmology: A Systematic Approach, 10th ed., pp. 300-301.
2. Lens-based procedures
A. Refractive lens exchange
The clear crystalline lens is removed and replaced with an IOL. Terms include clear lens extraction, refractive lens exchange (RLE), and presbyopic lens exchange.
This is particularly suitable for patients with early cataract, significant hyperopia, high refractive error, or those typically older than corneal-laser candidates.
Advantages
- Permanent correction of the lens component of refraction
- Prevents later age-related cataract in the operated eye
- Can correct astigmatism with a toric IOL
- Offers the greatest potential for spectacle independence
Risks
- Same intraocular risks as cataract surgery: infection, inflammation, cystoid macular edema, retinal detachment, posterior capsular opacification, and refractive surprise
- Retinal-detachment concern is greater in highly myopic eyes
- The procedure is less attractive in younger patients with clear lenses and low baseline risk of cataract
A recent review emphasizes careful selection, particularly in myopia, prior corneal refractive surgery, corneal disease, retinal pathology, and patients with demanding night-vision requirements. See this lens-replacement review.
B. Presbyopia-correcting IOLs
| IOL type | Typical visual profile | Main trade-off |
|---|---|---|
| Monofocal | Excellent single focal distance, usually distance | Reading glasses required |
| Monovision monofocal | One eye distance, other near/intermediate | Reduced stereoacuity and possible intolerance |
| Multifocal/bifocal | Distance and near vision | Halos, glare, lower contrast sensitivity |
| Trifocal | Distance, intermediate, and near vision | Dysphotopsia and contrast trade-off |
| EDOF | Strong distance/intermediate, functional near | Near vision may still need low-power readers |
| Accommodating IOL | Intended dynamic focus | Actual accommodative effect may be limited or variable |
Multifocal and trifocal lenses offer better near spectacle independence but can cause halos, glare, and reduced contrast sensitivity. Kanski notes that patients with severe persistent symptoms may require IOL exchange. Kanski's Clinical Ophthalmology: A Systematic Approach, 10th ed., p. 300.
A 2024 network meta-analysis of 28 randomized trials involving 2,465 participants found that trifocal IOLs generally gave the strongest near vision and spectacle independence, while EDOF and enhanced monofocal IOLs performed well for intermediate vision. This benefit must be balanced against visual-quality trade-offs, as reported in the systematic review.
3. Scleral expansion surgery
This attempts to alter scleral biomechanics and improve accommodation. Results have been inconsistent and unpredictable, so it has not achieved sustained clinical popularity. Kanski's Clinical Ophthalmology: A Systematic Approach, 10th ed., p. 300.
Patient selection
A suitable candidate should have:
- Stable refraction
- Healthy cornea and ocular surface
- No significant cataract, glaucoma, retinal disease, macular disease, or uncontrolled dry eye
- Realistic expectations about residual spectacle use
- Understanding of night-vision and contrast-sensitivity trade-offs
- A visual lifestyle that supports the chosen design, such as computer work, fine near work, or night driving
Avoid multifocal IOLs or use extra caution in patients with irregular corneas, significant dry eye, macular or optic-nerve disease, prior difficult refractive surgery, or occupations where high contrast and night vision are essential. Pilots and some military personnel may have occupational restrictions with multifocal IOLs.
Take-home points
- Laser monovision is a common corneal option and should usually be preceded by a contact-lens trial.
- RLE with a trifocal, multifocal, or EDOF IOL is the main lens-based solution, especially when cataract surgery is indicated.
- Trifocal IOLs maximize near spectacle independence, while EDOF lenses often provide a more comfortable distance-intermediate range with fewer near-vision gains.
- Corneal inlays and scleral expansion have more limited roles because of safety, predictability, or availability issues.
- Recent Cochrane evidence found only four randomized studies in non-cataract presbyopia surgery and judged much of the comparative evidence low or very low certainty. Thus, selection should be individualized rather than based on a claim that one operation is universally best. See the 2025 Cochrane review.
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